So, I bought MZ3D for my game, and looked in my game files to realize that I didn't have some files from when I was using MV, like the MV3D folder. I didn't care since for the first few days of development, I was just trying to convert my game to MZ. Not porting the files or anything, but cleaning out the plugins, tilesets, etc. But on the first day, I was transferring over files to my game. Halfway through the process, it had the MZ default files with MV default resources, well besides the tilesets since I made that by myself. The reason I had to have default files in my game that I wouldn't use is because some save data I had left over used RTP files for the characters and such, but I just kept all of them for convenience. With the switch to MZ, I've seen tons of popups for "Game Data has been modified externally. Do you want to save?" and "RPG Maker MZ - Not Responding", yet it's never crashed. I also had to convert parallax maps to normal maps  because it would work better in 3D.  Speaking of 3D, I noticed a POV glitch that was fixed because I didn't know how to use the MV3D plugin commands.