I also tested this using no mods other than the ones required to run Indrev using the most recent mod loader for both fabric and quilt which did not fix the issue. Issues remains on both fabric loader and quilt loader.

Yup can confirm, also the chat gets transparent, is there a way to disable that feature or something?

I have the same situation with 1.20.1/Fabric.
I feel uncomfortable with the transparency/lightness of the GUI.