Have you checked ProtonDB? https://www.protondb.com/app/2623190 It's okay if you haven't, less people than I'd expect know about it.

I see this here from a month ago:

Tinker Steps:Switch to experimental, Changed configuration
Issue

After the update from 1.1 to 1.2, the game would crash with Unreal Engine 5 errors after the initial shader cache loading.

    LowLevelFatalError -- Bad export index … WBP_Modern_CharacterCreation_EditableText_C

Happens after Bethesda’s update due to mismatched Unreal 5 caches and corrupted .pak files left behind by Steam in the shader caches and games compatdata directory.
Fix

    Uninstalled the game.
    Remove all leftover files
    Reinstall game

rm -rf ~/.steam/root/steamapps/compatdata/2623190
rm -rf ~/.steam/root/steamapps/shadercache/2623190
rm -rf ~/.steam/steam/steamapps/compatdata/2623190
rm -rf ~/.steam/steam/steamapps/common/"Oblivion Remastered"
rm -rf ~/.steam/steam/steamapps/shadercache/2623190
rm -rf ~/.cache/OblivionRemastered ~/.cache/unreal*

Clear out the unreal engine cache

rm -rf ~/.cache/OblivionRemastered
rm -rf ~/.cache/unreal*
rm -rf ~/.cache/mesa_shader_cache

Graphics:Minor Artifacts
Performance:Slight Performance Problems

Poorly optmized game. Engine.ini tweaks and performance tweaking is required.

GPU: Intel Arc A770 16 GB VRAM

https://www.amazon.com/s?k=nvidia+gpu+16gb

since you're downvoting people who try to help you, allow me to return that energy to you.

This is not super helpful, but from what I've been following from various youtubers... it seems like this game is to a significant extent, yet another broken Bethseda release.

Like uh, Fallout 4's recent mega update has also just broked it up completely, like just actually fundamentally broken, and it would not surprise me at all if the recent FO4 update and Oblivion Remaster share a good deal of a codebase.

EDIT:

Ok, maybe this could be worth a try:

Run it in Proton Experimental.

Its a bit more uh, cutting edge, not quite as bleeding edge and unstable as it was a year or two ago, generally its pretty stable, at least in my experience, and its got a bunch more updates than the mainline 9 version.

EDIT 2:

If that doesn't change anything, or you've already done it, ... throw that whole error message log at me, I can try to see if I can make any sense of it.