Docker container unable to resolve hosts

I just reinsalled OMV 5 completely and am currently trying to restart all my dockers. They all seem to be running but none of them seem have any connection to the internet.

I already tried nslookup and ping inside and outside the containers and that both works (after removing mdns4 from /etc/nsswitch.conf)

/etc/resolv.conf is the same as the Host machine (except for custom bridge networks)

Everything runs almost like normal but:

- Nextcloud cannot check für Updates and call the App Store

- Plex cannot get any Metadata

- Minecraft cannot Authenticate any user

- ...

Anybody have any idea how to solve this?

UPDATE:

Tried docker exec with user-id used by docker. ping, nslookup etc. do not work with that.

Will report to docker-ce.