Originally posted by umop-apisdn:

Uninstall again, but this time delete the Valheim folder from wherever your Steam library is (the default is "C:\Program Files\Steam\steamapps\common\Valheim"). Reinstall, don't add your mods, and see if you still have the issue.

You just saved 160 hours of gameplay (thought it was 90h originally but boy was I wrong). Thank you so much!