FragmentStatePagerAdapter does not call fragments

I have FragmentStatePagerAdapter

a snippet with a pager. Inside the pager, I have two fragments to switch between them. What happens when I first came to the fragment, everything is done correctly, but when I go back and go back there again, then on the base fragment it is usually called onCreate

, onCreateView

etc., but on the fragments in the pager nothing is called, getItem

on the adapter it is not called, and the pager view is empty. On all the snippets I have setRetainInstance(true)

what is needed due to handling the rotation behavior.

Can you guys help me what to do about this?