I dont know about older versions but on 1.21 resource packs doesn't fully load. It just gets stuck on the loading screen.

Do you have Sodium installed?

I do have it installed and it doesn't work

I do have it installed and it doesn't work

Indium is required when Sodium is installed
Indium has not yet released an update to support Minecraft 1.21 so we'll have to wait for the Indium author to update the mod