In addition to the beta testing I am carrying out on 1029 on my iPad (8th Generation) iPadOS 15.1, I have purchased the latest App Store release (1027) for use on an older iPad Air 2 also updated to iPadOS 15.1. Often, although not every time, it crashes about six seconds into start up. When I check for active Apps this is a screenshot of what I see i.e. the App seems to be active but the iPad display shows the Home Screen with App icons.
[Release 1024] Crashes During Start Up On iPad Air 2 iPadOS 15.1 (Answer: Reinstall App)