Updated Collabora, now unable to open documents

Are you using the reverse proxy, that is recommended on Nextcloud’s page? Please note that URL scheme has changed, because it was not useable with HAProxy.

You need:
# Main websocket
ProxyPassMatch “/lool/(.*)/ws$” wss://127.0.0.1:9980/lool/$1/ws
Instead of:

Main websocket

ProxyPass /lool/ws wss://127.0.0.1:9980/lool/ws

I hope this helps.