Offline storage with IOS app stopped working after Nextcould 18

Using nextcloud 18, I noticed that I cannot acces txt files saved as ny favourites like I could before when I do not have network access to the nextcloud server. Not even after I redownloadad the files.

It does, however work when my phone is in flightmode, but not when the nextcould server is unreachable.

My setup, which is fairly common is to have a nextcloud server hosted at a 10.0.0.xx address, which is not reachable when I leave my home wifi. Trying to access files just shows a spinning loader.

Anyone else noticed that?