App not displaying launch screen. Long booting process with grayed AppIcon

Hello, one of my users is experiencing this kind of issue:

1. He taps on my app attached to the Dock.
2. App icons turns gray, indicating the process is started.
3. This state with him looking at his iOS homepage with icon grayed out stays for a second or two.
4. App launches immediately, without displaying the Launch Screen.

iPhone 14 Pro Max iOS 16.3.1 (video is from this system, but on 16.6 it happened for the same user too)

He claims that the issue happens only when the app was turned off for a longer time (for example a day of inactivity). After this first longer broken launch, next launches works much faster and display launch screen properly.