After upgrading my project to Babylon.js 9.3.4, the scene turns gray whenever I enable ImageProcessing.
This issue does not occur in version 8.37.1; everything works fine there.
Has anyone encountered this regression or knows what might have changed in the rendering pipeline?

It looks like a problem between linear and gamma space…
Can you create a reproduction in the Playground so that we can investigate the problem?
Thanks in advance!
When you use HDR mode with the default rendering pipeline, you must convert the clear color of the scene to linear space: