@TeamYouTube Guys, I am unable to add ad breaks in the youtube studio beta editor, I have to go bakc to the classic one in order to be able to place them, it's just impossible to use the editor since a couple days ago, tried multiple browsers and it still happens, thanks!
There's no error, the button to add the ads don't show up, and the timeline doesn't work at all, but now that I tried again it works, so it seems to be fixed :3