We have implemented a system which gets data from xml files. Everything works fine in editor, but when packaging for IOS, app gets stuck on splash screen. I also packaged the game for win64 and everything works fine, so the problem seems to be platform specific.
I added folder with xmls to “Additional Non-assets directories to copy” section in packaging settings and it copies fine into packaged versions of the game, but causes the mentioned freeze on IOS.
We resolved the problem. Turns out in packaging options you need to use “Additional Non-Asset Directories to Package”, not the copy one. Just for IOS though.