When I was coding something, I went to set the thumbnail. I went out of the project to check if it set. It did set, so I went back in the project. It wasn't working as usual, so I went into "see inside" to debug, and suddenly, I saw this. If you want these hacked blocks for some reason check inside the project
Do any of you know why it happened? I will upload a project on my main account where you can comment.