Apple stopped signing iPadOS 17.7.7 – bug fix release for previous iPadOS – following the reports of issues with apps.
Users reported that apps logged users out and did not allow to login again. Apps included Wikipedia, YouTube and others.
It is expected that Apple will publish updated iPadOS 17.x release addressing these issues soon.
Reference: Apple Stops Signing iPadOS 17.7.7 After Reports of App Login Issues