Nextcloud 30.0.5 (Proxmox, LXC, Alpine) + (Traefik, LXC, Proxmox) - blank screen during access via domain

Hi,
I’m using Nextcloud 30.0.5 and Traefik via Proxmox.
Both Apps are LXC.
Proxmox-Host = 192.168.200.200
Traefik-LXC = 192.168.200.201
Nextcloud-LXC = 192.168.200.215

Both apps were set up using the latest Helper Scripts from Proxmox-Helper-Scripts (NC = Alpine-Edition).

Trusted Domain and Trusted Proxies are set in the config.php, but I’m getting only a blank screen while accessing NC via my domain.
IP-Access is working.
Of coure, I tried different browsers - also in private mode.

My config.php in the Nextcloud-LXC
My yaml in the Traefik-LXC

You’re more likely to get a response if you fill out the support template rather than ignore it.

The Web browser section of it in particular would likely be pretty informative.