Sync seems to work

Assets/Scenes/PacMan.unity

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     SerializationNodes: []
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-  networkManager: {fileID: 1200574210}
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+  - {fileID: 357748371}
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-  networkManager: {fileID: 1200574210}
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   mode: 1
@@ -20640,6 +20723,7 @@ Transform:
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 --- !u!1001 &697998654
@@ -33745,31 +33829,7 @@ MonoBehaviour:
   m_OnClick:
     m_PersistentCalls:
       m_Calls:
-      - m_Target: {fileID: 1156754005}
+      - m_Target: {fileID: 405256686}
-        m_TargetAssemblyTypeName: 
-        m_MethodName: SendCustomEvent
-        m_Mode: 5
-        m_Arguments:
-          m_ObjectArgument: {fileID: 0}
-          m_ObjectArgumentAssemblyTypeName: UnityEngine.Object, UnityEngine
-          m_IntArgument: 0
-          m_FloatArgument: 0
-          m_StringArgument: SyncButtonPressed
-          m_BoolArgument: 0
-        m_CallState: 2
-      - m_Target: {fileID: 527776390}
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-        m_Mode: 5
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@@ -35600,7 +35660,6 @@ MonoBehaviour:
     PrefabModifications: []
     SerializationNodes: []
   _udonSharpBackingUdonBehaviour: {fileID: 1156754005}
-  networkManager: {fileID: 1200574210}
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   end: {fileID: 312606797}
   mode: 0
@@ -52780,31 +52839,7 @@ MonoBehaviour:
   m_OnClick:
     m_PersistentCalls:
       m_Calls:
-      - m_Target: {fileID: 1156754005}
+      - m_Target: {fileID: 405256686}
-        m_TargetAssemblyTypeName: 
-        m_MethodName: SendCustomEvent
-        m_Mode: 5
-        m_Arguments:
-          m_ObjectArgument: {fileID: 0}
-          m_ObjectArgumentAssemblyTypeName: UnityEngine.Object, UnityEngine
-          m_IntArgument: 0
-          m_FloatArgument: 0
-          m_StringArgument: UpButtonPressed
-          m_BoolArgument: 0
-        m_CallState: 2
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         m_Mode: 5
@@ -54424,6 +54459,10 @@ MonoBehaviour:
     ID: 307
     SerializedTypeNames:
     - VRC.Udon.UdonBehaviour
+  - gameObject: {fileID: 405256684}
+    ID: 308
+    SerializedTypeNames:
+    - VRC.Udon.UdonBehaviour
   portraitCameraPositionOffset: {x: 0, y: 0, z: 0}
   portraitCameraRotationOffset: {x: 0, y: 1, z: 0, w: -0.00000004371139}
   PlayerPersistence: []

Assets/Test stuff/TestBall.cs

@@ -40,6 +40,8 @@ public class TestBall : SyncedObject
 
     public override void SyncedUpdate()
     {
+        SetProgress(GetProgress()); // A quick test that these methods work correctly
+
         DeltaUp(-DownPerSecond * networkManager.Dt);
 
         UpdateProgress();
@@ -55,7 +57,7 @@ public class TestBall : SyncedObject
 
     private void SetProgress(float progress)
     {
-        var currentTimestamp = NetworkManager.TimeToTimestamp(networkManager.SyncedTime);
+        var currentTimestamp = GetCurrentTimestamp();
         loopOffset = (int)(currentTimestamp - progress * LoopTimeMs);
     }
 
@@ -101,13 +103,13 @@ public class TestBall : SyncedObject
     {
         DeltaUp(UpPerPress);
         Debug.Log($"({nameof(TestBall)}) Up button pressed, jumped up at {GetProgress()} to {amountUp}.");
-        networkManager.SendEvent((NetworkEventType)1);
     }
 
     public override void AppendSyncedData(byte[][] data, ref int index, NetworkEventType eventType)
     {
         if (eventType == 0)
         {
+            Debug.Log($"({nameof(TestBall)}) Sending sync data at progress {GetProgress()} and amountUp {amountUp}.");
             data[index++] = BitConverter.GetBytes(amountUp);
             data[index++] = BitConverter.GetBytes(GetProgress());
         }

Assets/Test stuff/TestBallManager.asset

@@ -43,7 +43,139 @@ MonoBehaviour:
       Data: 
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-      Data: 0
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+      Entry: 1
+      Data: testBalls
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+    - Name: 
+      Entry: 1
+      Data: UnityEngine.Component[], UnityEngine.CoreModule
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: <SyncMode>k__BackingField
+      Entry: 7
+      Data: System.Nullable`1[[UdonSharp.UdonSyncMode, UdonSharp.Runtime]], mscorlib
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Assets/Test stuff/TestBallManager.cs

@@ -38,6 +38,5 @@ public class TestBallManager : UdonSharpBehaviour
         {
             networkManager.SendEvent((NetworkEventType)0);
         }
-        Debug.Log($"({nameof(TestBall)}) Sync button pressed, synced at progress {GetProgress()} and amountUp {amountUp}.");
     }
 }