What about LWRP? I'm on the latest Focus & WaveVR versions but the same issue still occurs.
btw, there's still some SRP code missing in WaveVR_Camera & WaveVR_Distortion
https://docs.unity3d.com/ScriptReference/Rendering.RenderPipelineManager-beginFrameRendering.html
https://docs.unity3d.com/ScriptReference/Rendering.RenderPipelineManager-endFrameRendering.html