This script will revert all UI changes prior to late 2022 (which disables rounded corners on everything and reverts 2019-2022 backgrounds.)
< Feedback on YouTube - Revert UI changes before late-2022 (Non-Rounded Design)
I tried again and everything works now (maybe the Youtube guys tested something?)
I really love this script, I have been using it for a while... however, dont know since when, but it makes all links unclickable(!) - like the blue underlined ones in the descriptions, tags. Related vids, show more buttons etc. are ok.