[SOLVED] Creative tabs broke my entire workspace

I downloaded the new update and imported a mod, and for a while there were no issues. At one point I decided to add some new creative tabs for my custom items, and things quickly went downhill. Right off the bat, all of the tabs' names showed up in-game as their id, not the name I'd set (e.g. "beyond:manufacturing" (mod id is "beyond")). To make matters worse, every item I created after making the bugged tags wouldn't show up in the creative inventory at all.

I had some pre-existing creative tabs from before the update, and I had deleted some of them to replace with new ones, so I figured it must be some kind of bug where I accidentally left a now deleted creative tab assigned to an item or something. To solve the bug, I deleted all custom creative tabs, then manually went through every item and block and cleared them of all their assigned tabs (even vanilla ones). I ran the game again, but all of the tabs from earlier still existed, and all of the items I had previously organized into the bugged tabs were still there.

At this point it was clear that the game had locked these tabs as they were, preventing me from adding or removing any items from them. Unsure how to solve the bug, I tried regenerating the code. It told me that some elements hadn't compiled correctly (or something along those lines), but when I used the filter to check for elements with errors, none showed up. Every subsequent time I've regenerated the code it has said the same thing. I can't run the game either, and restarting MCreator doesn't do anything. Is this a bug with the new update? Will I just have to wait until it gets patched? Please help :(

SMALL UPDATE: Trying to run the debugger results in another error message and an infinite connecting screen