Sergio, thanks for your message. I have the same feeling (to wait a while untill they get all the problems set).
In my opinion, moodle dev team has acted hastily releasing this new "core oauth2". Very fast, but inefficient.
I tried to install both oath2 on my DEV server and they didn't work properly. It means, I can't update my moodle anymore till this point is completely clarified by moodle team.
Again, thanks.
Best Regards,
Filipe