Is it a BUG?: Paperless-mobile doesn't work for me on TLS enabled Paperless ngx

[nodeam]

I have a some kind of 'bare metal' Paperless installation ( Proxmox, Debian 12.6, unprivileged container, Paperless 2.11.0 installed by this script: https://tteck.github.io/Proxmox/#paperless-ngx-lxc ). So no Docker involved.

Paperless-Mobile is working without an issue at this point.

However, because of my Zero-Trust-Policy I have then enabled TLS in Gunicorn. Since this is supported officially by Gunicorn.

I'm running a private Root-CA-Authority which issues all the certificates and keys for my LAN-Devices. The root-CA certificate is installed on every client.

So I added the server cert (for FQDN and IP) also to Paperless (Gunicorn):

echo "certfile = '/etc/ssl/certs/ppaperless.local.crt'" >> /opt/paperless/gunicorn.conf.py
echo "keyfile = '/etc/ssl/private/ppaperless.local.key'" >> /opt/paperless/gunicorn.conf.py

Now, every browser on any device I posses runs without an issue at this point. Only Paperless-mobile has issues (installed on GrapheneOs Android 14 and LineageOS Android 13). I can log in and set up the app, I can see all my documents, but I cant load them, neither pdf's nor the meta (formular). It's stuck while loading. I've tested paperless-mobile v3.2.1 and v3.2.0. v3.1.8 doesn't even log in.

The only issue I've found in app-log was something about finding API v5 and falling back to last supported v3.

Is this a bug or an intended behavior?

Thx / Danke