Yeah, the beta did fix the problem, but it came back in the official release. I don't know why, maybe there was some issue they had to revert the fix. It's very frustrating for me too.
https://bugs.webkit.org/show_bug.cgi?id=261950
I have a workaround to allow to scroll over videos, for next release but it doesn't work perfectly.
small rant, I really hate major iOS updates. There's always bad Safari regressions.