diff --git a/src.csharp/AlphaTab.Test/VisualTests/VisualTestHelper.cs b/src.csharp/AlphaTab.Test/VisualTests/VisualTestHelper.cs
index b71059892..af5230016 100644
--- a/src.csharp/AlphaTab.Test/VisualTests/VisualTestHelper.cs
+++ b/src.csharp/AlphaTab.Test/VisualTests/VisualTestHelper.cs
@@ -99,7 +99,7 @@ public static async Task RunVisualTestScore(Score score, string referenceFileNam
             {
                 Width = 1300
             };
-            renderer.PreRender.On(isResize => 
+            renderer.PreRender.On(isResize =>
             {
                 result = new AlphaTab.Core.List<RenderFinishedEventArgs>();
                 totalWidth = 0.0;
@@ -129,9 +129,7 @@ public static async Task RunVisualTestScore(Score score, string referenceFileNam
             });
             renderer.Error.On((e) => { task.SetException(e); });
 
-            var renderScore =
-                JsonConverter.JsObjectToScore(JsonConverter.ScoreToJsObject(score), settings);
-            renderer.RenderScore(renderScore, tracks);
+            renderer.RenderScore(score, tracks);
 
             if (await Task.WhenAny(task.Task, Task.Delay(2000)) == task.Task)
             {
diff --git a/src.csharp/AlphaTab/Platform/CSharp/ManagedThreadScoreRenderer.cs b/src.csharp/AlphaTab/Platform/CSharp/ManagedThreadScoreRenderer.cs
index 9c0e6efff..9ac669c5b 100644
--- a/src.csharp/AlphaTab/Platform/CSharp/ManagedThreadScoreRenderer.cs
+++ b/src.csharp/AlphaTab/Platform/CSharp/ManagedThreadScoreRenderer.cs
@@ -147,9 +147,8 @@ public void RenderScore(Score score, IList<double> trackIndexes)
             }
             else
             {
-                var serialized = JsonConverter.ScoreToJsObject(score);
                 _workerQueue.Add(() =>
-                    RenderScore(JsonConverter.JsObjectToScore(serialized, _renderer.Settings),
+                    RenderScore(score,
                         trackIndexes));
             }
         }
diff --git a/src.kotlin/alphaTab/src/jvmTest/kotlin/alphaTab/visualTests/VisualTestHelperPartials.kt b/src.kotlin/alphaTab/src/jvmTest/kotlin/alphaTab/visualTests/VisualTestHelperPartials.kt
index 8ebb2fe56..173c0bab2 100644
--- a/src.kotlin/alphaTab/src/jvmTest/kotlin/alphaTab/visualTests/VisualTestHelperPartials.kt
+++ b/src.kotlin/alphaTab/src/jvmTest/kotlin/alphaTab/visualTests/VisualTestHelperPartials.kt
@@ -159,9 +159,7 @@ class VisualTestHelperPartials {
 
             val job = GlobalScope.launch {
                 try {
-                    val renderScore =
-                        JsonConverter.jsObjectToScore(JsonConverter.scoreToJsObject(score), settings);
-                    renderer.renderScore(renderScore, actualTracks)
+                    renderer.renderScore(score, actualTracks)
                 } catch (e: Throwable) {
                     error = e
                     waitHandle.release()
diff --git a/src/model/Beat.ts b/src/model/Beat.ts
index f623b31d4..81e904ccb 100644
--- a/src/model/Beat.ts
+++ b/src/model/Beat.ts
@@ -802,8 +802,17 @@ export class Beat {
             this.graceGroup = new GraceGroup();
             this.graceGroup.addBeat(this);
             this.graceGroup.isComplete = true;
+            this.graceGroup.finish();
             this.updateDurations();
             this.voice.insertBeat(this, cloneBeat);
+
+            // ensure cloned beat has also a grace simple grace group for itself
+            // (see Voice.finish where every beat gets one)
+            // this ensures later that grace rods are assigned correctly to this beat. 
+            cloneBeat.graceGroup = new GraceGroup();
+            cloneBeat.graceGroup.addBeat(this);
+            cloneBeat.graceGroup.isComplete = true;
+            cloneBeat.graceGroup.finish();
         }
     }
 
diff --git a/src/model/GraceGroup.ts b/src/model/GraceGroup.ts
index db6aae5d4..a7d4c0f92 100644
--- a/src/model/GraceGroup.ts
+++ b/src/model/GraceGroup.ts
@@ -16,7 +16,7 @@ export class GraceGroup {
 
     /**
      * true if the grace beat are followed by a normal beat within the same
-     * bar. 
+     * bar.
      */
     public isComplete: boolean = false;
 
@@ -25,11 +25,14 @@ export class GraceGroup {
      * @param beat The beat to add
      */
     public addBeat(beat: Beat) {
-        if (this.beats.length === 0) {
-            this.id = beat.absoluteDisplayStart + "_" + beat.voice.index;
-        }
         beat.graceIndex = this.beats.length;
         beat.graceGroup = this;
         this.beats.push(beat);
     }
+
+    public finish() {
+        if (this.beats.length > 0) {
+            this.id = this.beats[0].absoluteDisplayStart + '_' + this.beats[0].voice.index;
+        }
+    }
 }
diff --git a/src/model/Voice.ts b/src/model/Voice.ts
index 0fe5bd0de..c6224a8cf 100644
--- a/src/model/Voice.ts
+++ b/src/model/Voice.ts
@@ -141,7 +141,8 @@ export class Voice {
                     const lastGraceBeat = beat.graceGroup!.beats[beat.graceGroup!.beats.length - 1];
                     if (firstGraceBeat.graceType !== GraceType.BendGrace) {
                         // find out the stolen duration first
-                        let stolenDuration: number = (lastGraceBeat.playbackStart + lastGraceBeat.playbackDuration) - firstGraceBeat.playbackStart;
+                        let stolenDuration: number =
+                            lastGraceBeat.playbackStart + lastGraceBeat.playbackDuration - firstGraceBeat.playbackStart;
 
                         switch (firstGraceBeat.graceType) {
                             case GraceType.BeforeBeat:
@@ -150,7 +151,8 @@ export class Voice {
                                     firstGraceBeat.previousBeat.playbackDuration -= stolenDuration;
                                     // place beats starting after new beat end
                                     if (firstGraceBeat.previousBeat.voice == this) {
-                                        currentPlaybackTick = firstGraceBeat.previousBeat.playbackStart +
+                                        currentPlaybackTick =
+                                            firstGraceBeat.previousBeat.playbackStart +
                                             firstGraceBeat.previousBeat.playbackDuration;
                                     } else {
                                         // stealing into the previous bar
@@ -170,7 +172,7 @@ export class Voice {
 
                                 break;
                             case GraceType.OnBeat:
-                                // steal duration from current beat 
+                                // steal duration from current beat
                                 beat.playbackDuration -= stolenDuration;
                                 if (lastGraceBeat.voice === this) {
                                     // with changed durations, update current position to be after the last grace beat
@@ -184,6 +186,9 @@ export class Voice {
                     }
                 }
 
+                beat.displayStart = currentDisplayTick;
+                beat.playbackStart = currentPlaybackTick;   
+
                 if (beat.fermata) {
                     this.bar.masterBar.addFermata(beat.playbackStart, beat.fermata);
                 } else {
@@ -191,11 +196,15 @@ export class Voice {
                 }
 
                 this._beatLookup.set(beat.playbackStart, beat);
+            } else {
+                beat.displayStart = currentDisplayTick;
+                beat.playbackStart = currentPlaybackTick;    
             }
 
-            beat.displayStart = currentDisplayTick;
-            beat.playbackStart = currentPlaybackTick;
             beat.finishTuplet();
+            if (beat.graceGroup) {
+                beat.graceGroup.finish();
+            }
             currentDisplayTick += beat.displayDuration;
             currentPlaybackTick += beat.playbackDuration;
         }