Destroy context by directly calling into the library instead of using a plugin event. Seems perfectly stable in testing and fixes an issue where occasionally the wrong context index would come through in native code.

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/PSSRUpscaler.cs

@@ -71,16 +71,11 @@ namespace UnityEngine.Rendering.PostProcessing
 			
 			if (_contextInitialized)
 			{
-				_dispatchParams.contextIndex = _currentContext;
-				Marshal.StructureToPtr(_dispatchParams, _dispatchParamsBuffer, false);
-
+				// Rotate between contexts to reduce the risk of race conditions between old and new contexts
+				uint previousContext = _currentContext;
 				_currentContext = (_currentContext + 1) % PSSRPlugin.MaxNumContexts;
 				
-				// Destroying the context from the render thread reduces the risk of race conditions causing crashes
-				var cmd = new CommandBuffer();
-				cmd.IssuePluginEventAndData(PSSRPlugin.GetRenderEventAndDataFunc(), 2, _dispatchParamsBuffer);
-				Graphics.ExecuteCommandBuffer(cmd);
-				cmd.Release();
+				PSSRPlugin.DestroyPssrContext(previousContext);
 				
 				_contextInitialized = false;
 			}
@@ -206,7 +201,7 @@ namespace UnityEngine.Rendering.PostProcessing
 			public static extern int CreatePssrContext(ref InitParams initParams, out IntPtr outputColorTexturePtr);
 
 			[DllImport(LibraryName)]
-			public static extern void DestroyPssrContext();
+			public static extern void DestroyPssrContext(uint contextIndex);
 
 			[Serializable, StructLayout(LayoutKind.Sequential)]
 			public struct InitParams