Ey! Reminds me of my middle-school years! I still can't belive I made an entire game without a single class... Just storing info in arrays and writing in comments what location represents what data. But I was a literal child, too young to read guides or sit through "long" tutorials.
I don't want to sound too mean, but whenever I see anything similar at work, I wish that person get a job they're actually good at. It's fine and all that the company started hiring actual programmers to fix things, but the fact that the old crew still fucks shit up with senior privileges is a major grievance.
Honestly no idea why someone would go around a completely unknown menu in a new unknown editor and randomly click things with caution completely out the window. Not having a copy or trying a blank project, not even reading any messages. I mean even if we don't know it's a nuke button, God knows what other edits it could do to your code without you knowing.
This goes beyond rookie mistake. This is something 12 year old me would do. Same with the issue page being 90% swear words.