Multiplatform pakages went blackscreen for 2mins after unreal logo

Hi,
Currently, we’re facing a bug that is unidentifiable which the screen will turn pure black with nothing for about 2 mins every time we try to open the game with the installed package (windows, ios, android). It was fine using 4.24 but since the app store no longer supports 4.24 for packaging IOS package, so we had to update our project to 4.26.

Do you have any idea how to solve this?