[GAMEPLAY] [CLIENT] Switched to legacy client after using new client. Masteries are stuck on onepage

I can't change my masteries to anything else. I changed a mastery page on the new client while i was in champion select, then after the game i switch to old client after accidentaly dodging a champion select. In legacy client I now cant change my masteries. ALl i get is an error and it says a report has been sent to the servers. It's not fun having to play ranked with wrong masteries all the time.