I got no issues whatsoever. Are you using any browser addons besides uBlock origin? I've been using ghostery for quite some time (which also has an ad-suppression engine) and that cocked up with youtube. Removed it and now I can use it as always. Firefox 120.0.1.
Open your videos in Incognito mode, the block is cookie-based. I open YT on my browser in normal mode to see all my subscriptions, then open the videos in incognito with adblock enabled.