Worlds with Cheats on no longer have cheats and pressing Save & Quit softlocks the game

First, this happened on Minecraft 1.16.3, not 1.16.4. It didn't let me choose 1.16.3 as the affected version. But anyways, last night I started having this problem where if I went into a world that had cheats on, they wouldn't be there and I couldn't use any cheats. Also, once I save and quit the world, Minecraft softlocks and I can't do anything about it except end the task. This seems to have happened after I changed the name of my profile on the minecraft website. Restarting my computer didn't help and now I am lost on what to do except wait