Blender 4.0 will be shipping with a new OCIOv2 config.
In addition to Blender FILMIC there will be a newer view transform called AgX.
As Blender 4.0 is still in an alpha stage, the defaults in the color management area are a bit strange at the moment (3rd of September 2023).
Here is a little guide how to set some of the settings to avoid running into troubles.
Please continue reading: “1.5.1. Blender 4.0 is coming…“