It has been reported way more on the US forums where we are trying to keep all reports under a single thread: https://us.forums.blizzard.com/en/wow/t/cannot-take-specific-class-talent/1382533
Let’s try to do something similar. Here is my original thread in EU forums: Unable to learn talent - #3 by Tawae-silvermoon
we could bump it up and redirect new reports there so the thread gets attention.
So far, nothing works, even if you log out and log in, some talents may start working, but choice nodes are forever bugged. Several people tried faction change, deleting undeleting, uninstalling, clearing cache, and changing servers.