Array Assertion failed only in packaged game

There are no circumstances where my game ever logs an error, literally none and I’ve tested it for hours on hours on hours in the editor. so I wanted to get a friend to do some testing, but the game crashes at a very specific moment in the packaged build, every single time, it happens right after my code loads the players worldsave modifications (the save is read from a custom file structure so the behavior in the editor and a fresh build is the same) I believe its the moment the game tries to start spawning ism. the code is not written in c++ however it is nativized blueprints. and just getting the game to build with success has taken multiple weeks