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YouTube is deliberately crippling Firefox on ARM systems
(social.treehouse.systems)
This is a most excellent place for technology news and articles.
That's exactly what this is doing. It captures all youtube.com/watch, youtube.com/shorts and youtu.be/ pages and redirects then to the same page on invidious. Just replace %yourinstanceofchoice% with yewtu.be.
If you don't open videos you want to watch in a new tab, you also have to go to Advanced Options in your rule and tick "HistoryState" else it will bypass the redirect.
This should work for you: