The expected grayscale effect from the tutorial does not work (Unity 2022.3.10f1, URP 14.0.8)

[ahmnot]

The expected grayscale effect from the tutorial does not work in Unity 2022.3.10f1 with URP 14.0.8. I only get 3 warnings, like this:

CommandBuffer: temporary render texture _AfterPostProcessTexture not found while executing Custom PostProcess after PostProcess (SetGlobalTexture)
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

CommandBuffer: temporary render texture _AfterPostProcessTexture not found while executing Custom PostProcess after PostProcess (SetRenderTarget)
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

CommandBuffer: temporary render texture _AfterPostProcessTexture not found while executing Custom PostProcess after PostProcess (Blit destination)
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

Steps to reproduce the behavior:
I have followed the tutorial. I set the effect on a global volume.

Expected behavior
Expected to see grayscale.

Screenshots

Desktop (please complete the following information):

• OS: Windows 10
• Unity Version: 2022.3.10f1
• URP 14.0.8
• Version 2.0 (jan 23 2021) of the Customizable Post-processing Stack for Universal Render Pipeline

Thank you