OMG I Never knew that!!!!
I asked in the reddit but no one answered. Thank you for the info. Not a bug, just a dumb user.

So this is what I know. I am making a huge game in the map editor. This has happened before, but I just thought I was crazy. When the game was AUTOSAVING, it just activated, like started running. The game was fully running in map editor. Very cool, but not for what I needed. This is the second time ...

I know that once that is save is loaded, even if I do nothing, it crashes. If I go back an autosave earlier (2 minutes) and wait, it didn't crash. Just trying to provide as much feedback as I can.

IDK, in the middle of a game, just logged onto it, and I keep getting this error. Here are my files it tells me to provide. Originally I thought it was trying to place a blueprint including rails, but it just pops up with time now. Complete game crash.