Content & Privacy Restrictions not working

I’m trying to block out web content from my devices. Basically all social media sites and other useless yet addictive crap. I’ve added the sites I want to block to the “Never Allow” list in Screen Time > Content & Privacy Restrictions > App Store, Media, Web & Games > Web Content. Last night, this was working as expected, but today this seems to have disabled itself. The sites are in the list, and the “Content & Privacy Restrictions” is enabled. But Safari doesn’t block any of the sites. Weird! Is this a bug? edit: I’ve edited the “Never Allow” list. This made Safari crash a few times, but now the blocks seem to work again. So this looks like a very buggy bit of iOS.