No Deferred Rendering: Failed to set shading scale, pipelineSceneData is invalid

I’m trying to enable deferred rendering but I get this error. Even when I open DEMOs: for example SSAO, or Deferred Cluster demo projects, something causes it to revert to forward rendering. “Failed to set shading scale, pipelineSceneData is invalid”

I also get this error: “Unable to deserialize DeferredPipeline. For non-CCClass types, they can only be marked as serializable by `CCClass.fastDefine”

If I choose any deferred shaders, the mesh appears invisible in the scene view.

I’m using Cocos Creator 3.6, but I also tried 3.4 - which was the native version for both of these demos.

Any help would be wonderful. Thanks.