Update 4/7: Plex users have spoken out about an issue for children with the new Watchlist being a backdoor into watching restricted content.
Read more about what’s going on in these Plex and reddit threads. But for now, it looks like even if you have children accounts set up with restrictions and even only let them watch content you own, be aware they may see explicit content through the new Watchlist and Discover suggestions.
Some have suggested the new features should be opt-in, not automatically added for all users. Hopefully, Plex responds soon. In the meantime, be careful with Plex for kids!
Also this article
Plex’s no Terrible, Horrible, No Good, Very Bad Week - Pocketables
April 11, 2022 - Paul E King
He is either a Plex forum user or is following this closely.
Good write up.