ExecuteCommandBuffer needs to be done last, otherwise the commands to release temporary RTs won't be executed and they'll be cleared on the next frame. Oops.

Assets/Scripts/Fsr2Context.cs

@@ -187,9 +187,9 @@ namespace FidelityFX
 
             _resourceFrameIndex = (_resourceFrameIndex + 1) % MaxQueuedFrames;
 
-            Graphics.ExecuteCommandBuffer(_commandBuffer);
-            
             Fsr2Pipeline.UnregisterResources(_commandBuffer);
+            
+            Graphics.ExecuteCommandBuffer(_commandBuffer);
         }
 
         public void GenerateReactiveMask(Fsr2.GenerateReactiveDescription dispatchParams)