diff --git a/apps/web/src/components/pullRequest/PullRequestDetailPanel.tsx b/apps/web/src/components/pullRequest/PullRequestDetailPanel.tsx
index cfc876dc39c1..b5b5fa2e4a3c 100644
--- a/apps/web/src/components/pullRequest/PullRequestDetailPanel.tsx
+++ b/apps/web/src/components/pullRequest/PullRequestDetailPanel.tsx
@@ -145,6 +145,7 @@ import {
   PULL_REQUEST_MERGE_METHOD_LABELS,
   readableFailure,
   readPullRequestDetailSnapshot,
+  resolvePullRequestReferenceHost,
   resolveDisplayedPullRequestDetail,
   resolvePullRequestPrimaryControl,
   allowsSinglePullRequestMerge,
@@ -523,18 +524,23 @@ export function PullRequestDetailPanel({
   onBack?: (() => void) | undefined;
 }) {
   const environmentConfigs = useServerConfigs();
+  const projects = useProjects();
+  const repositoryIdentity = projects.find(
+    (project) =>
+      project.id === requestedReference.projectId && project.environmentId === environmentId,
+  )?.repositoryIdentity;
   const supportsThreadPullRequests =
     environmentConfigs.get(environmentId)?.environment.capabilities.threadPullRequests === true;
   const reference = useMemo(
     () =>
       supportsThreadPullRequests
-        ? requestedReference
+        ? resolvePullRequestReferenceHost(requestedReference, repositoryIdentity)
         : {
             projectId: requestedReference.projectId,
             repository: requestedReference.repository,
             number: requestedReference.number,
           },
-    [requestedReference, supportsThreadPullRequests],
+    [requestedReference, repositoryIdentity, supportsThreadPullRequests],
   );
   const pullRequestKey = `${reference.projectId}:${reference.host ?? ""}:${reference.repository}#${reference.number}`;
   const matchingListEntry =
@@ -881,7 +887,6 @@ export function PullRequestDetailPanel({
   const newThread = useNewThreadHandler();
   const { environments } = useEnvironments();
   const primaryEnvironmentId = usePrimaryEnvironmentId();
-  const projects = useProjects();
   const unavailableGitHubUrl = useMemo(() => {
     const identity = projects.find(
       (project) => project.id === reference.projectId && project.environmentId === environmentId,
diff --git a/apps/web/src/components/pullRequest/pullRequestDetail.logic.test.ts b/apps/web/src/components/pullRequest/pullRequestDetail.logic.test.ts
index ae5a5067bf12..96133395f048 100644
--- a/apps/web/src/components/pullRequest/pullRequestDetail.logic.test.ts
+++ b/apps/web/src/components/pullRequest/pullRequestDetail.logic.test.ts
@@ -1,6 +1,7 @@
 import { resolvePlanFollowUpSubmission } from "../../proposedPlan";
 import { serializeLegacyContextMessage } from "@t3tools/shared/composerContextLegacySend";
 import {
+  ProjectId,
   PullRequestAction,
   type PullRequestCheck,
   type PullRequestComment,
@@ -40,6 +41,7 @@ import {
   readableFailure,
   readPullRequestDetailSnapshot,
   resolveDisplayedPullRequestDetail,
+  resolvePullRequestReferenceHost,
   resolvePullRequestPrimaryControl,
   allowsSinglePullRequestMerge,
   shouldRefreshPullRequestActivity,
@@ -1440,7 +1442,7 @@ describe("which actions need the host read again after they run", () => {
 });
 
 describe("cached pull request detail", () => {
-  const reference = { projectId: "project-1", repository: "acme/web", number: 7 };
+  const reference = { projectId: ProjectId.make("project-1"), repository: "acme/web", number: 7 };
   const detail = (overrides: Partial<PullRequestDetail> = {}): PullRequestDetail =>
     ({
       provider: "github",
@@ -1511,6 +1513,106 @@ describe("cached pull request detail", () => {
     expect(snapshot?.deletions).toBe(3);
   });
 
+  it("reuses a host-qualified snapshot when reopening a thread link without a host", () => {
+    const storage = makeStorage();
+    writePullRequestDetailSnapshot(
+      storage,
+      "env-1",
+      { ...reference, host: "github.com" },
+      detail(),
+    );
+    const resolved = resolvePullRequestReferenceHost(reference, {
+      canonicalKey: "github.com/acme/web",
+      locator: {
+        source: "git-remote",
+        remoteName: "origin",
+        remoteUrl: "https://github.com/acme/web.git",
+      },
+      provider: "github",
+    });
+    expect(readPullRequestDetailSnapshot(storage, "env-1", resolved)?.title).toBe(
+      "Cache the title",
+    );
+    const explicit = { ...reference, host: "github.example.com" };
+    expect(
+      resolvePullRequestReferenceHost(explicit, {
+        canonicalKey: "github.com/acme/web",
+        locator: {
+          source: "git-remote",
+          remoteName: "origin",
+          remoteUrl: "https://github.com/acme/web.git",
+        },
+      }),
+    ).toBe(explicit);
+  });
+
+  it("leaves server-resolved Azure SSH references unchanged", () => {
+    expect(
+      resolvePullRequestReferenceHost(reference, {
+        canonicalKey: "ssh.dev.azure.com/v3/org/project/web",
+        locator: {
+          source: "git-remote",
+          remoteName: "origin",
+          remoteUrl: "git@ssh.dev.azure.com:v3/org/project/web",
+        },
+        provider: "azure-devops",
+      }),
+    ).toBe(reference);
+    expect(resolvePullRequestReferenceHost(reference, undefined)).toBe(reference);
+  });
+
+  it("hydrates legacy hostless snapshots only for the matching host", () => {
+    const storage = makeStorage();
+    writePullRequestDetailSnapshot(storage, "env-1", reference, detail());
+    expect(
+      readPullRequestDetailSnapshot(storage, "env-1", { ...reference, host: "github.com" })?.title,
+    ).toBe("Cache the title");
+    expect(
+      readPullRequestDetailSnapshot(storage, "env-1", {
+        ...reference,
+        host: "github.example.com",
+      }),
+    ).toBeNull();
+  });
+
+  it("keeps Forgejo ports isolated when recovering legacy snapshots", () => {
+    const storage = makeStorage();
+    const cached = detail({
+      provider: "forgejo",
+      url: "https://forge.example:8443/acme/web/pulls/7",
+    });
+    writePullRequestDetailSnapshot(storage, "env-1", reference, cached);
+    const resolved = { ...reference, host: "forge.example:8443" };
+    expect(readPullRequestDetailSnapshot(storage, "env-1", resolved)?.title).toBe(cached.title);
+    expect(
+      readPullRequestDetailSnapshot(storage, "env-1", {
+        ...reference,
+        host: "forge.example:9443",
+      }),
+    ).toBeNull();
+    expect(
+      readPullRequestDetailSnapshot(storage, "env-1", {
+        ...reference,
+        host: "forge.example",
+      }),
+    ).toBeNull();
+  });
+
+  it.each(["github", "gitlab"] as const)(
+    "retains portless %s snapshot identities for custom web ports",
+    (provider) => {
+      const storage = makeStorage();
+      const host = `${provider}.example.com`;
+      const hosted = { ...reference, host };
+      const cached = detail({
+        provider,
+        url: `https://${host}:8443/acme/web/${provider === "github" ? "pull" : "-/merge_requests"}/7`,
+      });
+      writePullRequestDetailSnapshot(storage, "env-1", hosted, cached);
+      expect(readPullRequestDetailSnapshot(storage, "env-1", hosted)?.title).toBe(cached.title);
+    },
+  );
+
   it("keeps a cached tab painted while the live read replaces the counts", () => {
     const cached = detail();
     const live = detail({ additions: 40, deletions: 9, title: "Cache the title" });
@@ -1534,11 +1636,11 @@ describe("cached pull request detail", () => {
   it("isolates stored and displayed details between hosts with the same repository and number", () => {
     const storage = makeStorage();
     const publicRef = { ...reference, host: "github.com" };
-    const enterpriseRef = { ...reference, host: "github.example.com" };
+    const enterpriseRef = { ...reference, host: "ghe.example.com" };
     const publicDetail = detail();
     const enterpriseDetail = detail({
       title: "Enterprise change",
-      url: "https://github.example.com/acme/web/pull/7",
+      url: "https://ghe.example.com/acme/web/pull/7",
     });
     writePullRequestDetailSnapshot(storage, "env-1", publicRef, publicDetail);
     expect(readPullRequestDetailSnapshot(storage, "env-1", enterpriseRef)).toBeNull();
@@ -1572,6 +1674,9 @@ describe("cached pull request detail", () => {
     storage.setItem("t3.pullRequests.detail:env-1:project-1:acme/web#7", "{not json");
     expect(readPullRequestDetailSnapshot(storage, "env-1", reference)).toBeNull();
     expect(readPullRequestDetailSnapshot(undefined, "env-1", reference)).toBeNull();
+    const hosted = { ...reference, host: "github.com" };
+    writePullRequestDetailSnapshot(storage, "env-1", hosted, detail({ url: "invalid url" }));
+    expect(readPullRequestDetailSnapshot(storage, "env-1", hosted)).toBeNull();
   });
 });
 
diff --git a/apps/web/src/components/pullRequest/pullRequestDetail.logic.ts b/apps/web/src/components/pullRequest/pullRequestDetail.logic.ts
index be71c95ddc40..56e22e643e1e 100644
--- a/apps/web/src/components/pullRequest/pullRequestDetail.logic.ts
+++ b/apps/web/src/components/pullRequest/pullRequestDetail.logic.ts
@@ -1,8 +1,8 @@
 import * as Schema from "effect/Schema";
-import { parseChangeRequestUrl } from "@t3tools/shared/changeRequestUrl";
 
 import {
   PullRequestDetail,
+  pullRequestHostOf,
   type PullRequestAction,
   type PullRequestActor,
   type PullRequestBaseComparison,
@@ -15,6 +15,8 @@ import {
   type PullRequestMergeability,
   type PullRequestMergeMethod,
   type PullRequestReaction,
+  type PullRequestRef,
+  type RepositoryIdentity,
   type PullRequestReviewThread,
   type PullRequestState,
   type PullRequestUpdateMethod,
@@ -1092,6 +1094,15 @@ export function pullRequestActionNeedsHostRefresh(action: PullRequestAction): bo
 
 type SnapshotStorage = Pick<Storage, "getItem" | "setItem">;
 
+export function resolvePullRequestReferenceHost(
+  reference: PullRequestRef,
+  identity: RepositoryIdentity | null | undefined,
+): PullRequestRef {
+  // Other providers may resolve an SSH remote to a different web authority on the server.
+  if (reference.host !== undefined || identity?.provider !== "github") return reference;
+  return { ...reference, host: pullRequestHostOf(identity, "github") };
+}
+
 export interface PullRequestDetailSnapshotRef {
   readonly host?: string | undefined;
   readonly projectId: string;
@@ -1121,7 +1132,13 @@ export function readPullRequestDetailSnapshot(
   reference: PullRequestDetailSnapshotRef,
 ): PullRequestDetail | null {
   try {
-    const raw = storage?.getItem(pullRequestDetailSnapshotKey(environmentId, reference));
+    const raw =
+      storage?.getItem(pullRequestDetailSnapshotKey(environmentId, reference)) ??
+      (reference.host === undefined
+        ? null
+        : storage?.getItem(
+            pullRequestDetailSnapshotKey(environmentId, { ...reference, host: undefined }),
+          ));
     if (!raw) return null;
     const decoded = decodeDetailSnapshot(JSON.parse(raw));
     return decoded._tag === "Some"
@@ -1157,14 +1174,22 @@ export function resolveDisplayedPullRequestDetail(input: {
 }): PullRequestDetail | null {
   if (input.live !== null) return input.live;
   if (
-    input.cached !== null &&
-    input.cached.projectId === input.reference.projectId &&
-    input.cached.repository.toLowerCase() === input.reference.repository.toLowerCase() &&
-    input.cached.number === input.reference.number &&
-    (input.reference.host === undefined ||
-      parseChangeRequestUrl(input.cached.url)?.host === input.reference.host.toLowerCase())
+    input.cached === null ||
+    input.cached.projectId !== input.reference.projectId ||
+    input.cached.repository.toLowerCase() !== input.reference.repository.toLowerCase() ||
+    input.cached.number !== input.reference.number
   ) {
-    return input.cached;
+    return null;
+  }
+  if (input.reference.host === undefined) return input.cached;
+  try {
+    const url = new URL(input.cached.url);
+    const host = input.cached.provider === "forgejo" ? url.host : url.hostname;
+    return (url.protocol === "https:" || url.protocol === "http:") &&
+      host.toLowerCase() === input.reference.host.toLowerCase()
+      ? input.cached
+      : null;
+  } catch {
+    return null;
   }
-  return null;
 }
diff --git a/apps/web/src/hooks/useOpenPanelPullRequestUrl.ts b/apps/web/src/hooks/useOpenPanelPullRequestUrl.ts
index 20d31c6392a0..6719eaf89e40 100644
--- a/apps/web/src/hooks/useOpenPanelPullRequestUrl.ts
+++ b/apps/web/src/hooks/useOpenPanelPullRequestUrl.ts
@@ -5,6 +5,7 @@ import { useMemo } from "react";
 import {
   readPullRequestDetailSnapshot,
   resolveDisplayedPullRequestDetail,
+  resolvePullRequestReferenceHost,
 } from "../components/pullRequest/pullRequestDetail.logic";
 import { gitHubPullRequestBrowserUrl } from "../lib/openPullRequestLink";
 import { selectActiveRightPanelSurface, useRightPanelStore } from "../rightPanelStore";
@@ -17,28 +18,38 @@ export function useOpenPanelPullRequestUrl(threadRef: ScopedThreadRef | null) {
   const surface = useRightPanelStore((state) =>
     selectActiveRightPanelSurface(state.byThreadKey, threadRef),
   );
-  const reference = surface?.kind === "pull-request" ? surface : null;
-  const environmentId = reference?.environmentId
-    ? EnvironmentId.make(reference.environmentId)
+  const requestedReference = surface?.kind === "pull-request" ? surface : null;
+  const environmentId = requestedReference?.environmentId
+    ? EnvironmentId.make(requestedReference.environmentId)
     : threadRef?.environmentId;
   const supportsMultiplePullRequests = useSupportsMultiplePullRequests(environmentId ?? null);
   const project = useProject(
-    reference && environmentId
-      ? scopeProjectRef(environmentId, ProjectId.make(reference.projectId))
+    requestedReference && environmentId
+      ? scopeProjectRef(environmentId, ProjectId.make(requestedReference.projectId))
       : null,
   );
+  const reference = useMemo(() => {
+    if (requestedReference === null) return null;
+    const input = {
+      projectId: ProjectId.make(requestedReference.projectId),
+      repository: requestedReference.repository,
+      number: requestedReference.number,
+    };
+    return supportsMultiplePullRequests
+      ? resolvePullRequestReferenceHost(
+          {
+            ...input,
+            ...(requestedReference.host === undefined ? {} : { host: requestedReference.host }),
+          },
+          project?.repositoryIdentity,
+        )
+      : input;
+  }, [requestedReference, supportsMultiplePullRequests, project?.repositoryIdentity]);
   const detail = useEnvironmentQuery(
     reference && environmentId
       ? pullRequestEnvironment.detail({
           environmentId,
-          input: {
-            projectId: ProjectId.make(reference.projectId),
-            ...(supportsMultiplePullRequests && reference.host !== undefined
-              ? { host: reference.host }
-              : {}),
-            repository: reference.repository,
-            number: reference.number,
-          },
+          input: reference,
         })
       : null,
   ).data;
@@ -55,7 +66,7 @@ export function useOpenPanelPullRequestUrl(threadRef: ScopedThreadRef | null) {
   );
   return reference
     ? (resolveDisplayedPullRequestDetail({ live: detail, cached: cachedDetail, reference })?.url ??
-        reference.url ??
+        requestedReference?.url ??
         gitHubPullRequestBrowserUrl(
           project?.repositoryIdentity,
           reference.repository,