Hey,
I realised that I am not seeing any new saved posts/comments for feddit.de and a random list of comments I didn’t acutally save for my lemmy.world account.
It works fine on the web interfaces.
App version 1.0.12
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I had the same issue and fixed it by logging out and logging back in again.
That sadly didn’t work for me. May I ask which version you are using?
1.0.12. Maybe you could try this idea?
Which part is broken in the app? Saving things, or viewing the list of saved items? From your description it sounds like maybe just displaying the list is the broken part.