"Expected a Game Mode Setting" Bug, anyone know solution?

Hello, I’m trying to modify my game mode but importing settings gives me the bug mentioned in the topic title. It started right at the Season 15 patch. I can load up a preset or an existing code, game works just fine, and then copy that exact code and immediately try to paste it in and it gives me this error. Anyone know what causes it and (more importantly) what to do about it? Thank you!

Its because the mode was saved with seasonal gamemode, you cant load unless that gamemode returns to playlist.