diff --git a/chart/newsfragments/28822.significant b/chart/newsfragments/28822.significant
new file mode 100644
index 0000000000000..6ca95d1b21770
--- /dev/null
+++ b/chart/newsfragments/28822.significant
@@ -0,0 +1 @@
+The Chart does not allow to use both dags.persistence and dags.gitSync enabled together. This was a problematic combinations anyway and did not work as intended. The Chart now prevents this combination from being used.
diff --git a/chart/templates/check-values.yaml b/chart/templates/check-values.yaml
index 81fb80901730c..025fdcba2b2fc 100644
--- a/chart/templates/check-values.yaml
+++ b/chart/templates/check-values.yaml
@@ -60,3 +60,7 @@ The sole purpose of this yaml file is it to check the values file is consistent
     {{- end }}
 
   {{- end }}
+
+  {{- if and .Values.dags.persistence.enabled .Values.dags.gitSync.enabled }}
+    {{ required "The combination of dags persistence and gitSync has serious performance and atomicity issues. Choose either gitSync or dags persistence but not the two of them together." nil }}
+  {{- end }}
diff --git a/chart/values.yaml b/chart/values.yaml
index 17231711ee342..37f051a14607b 100644
--- a/chart/values.yaml
+++ b/chart/values.yaml
@@ -1813,6 +1813,7 @@ dags:
     ## optional subpath for dag volume mount
     subPath: ~
   gitSync:
+    # Enable git sync sidecar for dags. Cannot be set to True together with dags.persistence.enabled = True
     enabled: false
 
     # git repo clone url