Photos section in the Android app only shows a handful of recent pictures


I’m having an issue with the Android app on my Nextcloud instance. I cannot seem to look at more than ~40-60 recent pictures - the app doesn’t even try to load any more than that. It’s behaving as if that is the total amount present on my account, which is not the case.
I was using a Docker setup initially, and in trying to fix the issue I’ve set up a completely new instance that does not rely on Docker, and while the issue actually did disappear for a short while, it has since returned. The Photos app in the web interface appears to be unaffected. Deleting pictures does not seem to help, it just displays even fewer then.

I am using Nextcloud 19.0.3 running on Debian 10 with Apache/PHP-FPM, Memcached and PostgreSQL behind an Nginx reverse proxy. Bypassing the reverse proxy seems to make no difference. Furthermore, I am using LDAP to authenticate against an Active Directory server. There are no errors, warnings or even debug entries in the log pertaining to the issue at hand.

I frankly have no idea how to diagnose this issue, but I will certainly be glad to provide more details if needed.