Ok I fixed it.
I had to change the default level and starting level in project settings then close the project (It made me save another level when I closed). When I re opened the level it was fine. I then had to delete all the levels I’d saved trying to get it to work earlier.
I had to do this on all my 4.17 projects that were working fine yesterday saving correctly and whatnot.
Not sure what happened but I figured I’d leave this up in case anyone else has this happen.