I use graphene OS on my Pixel 4a. Unfortunately I'm getting very strange DNS resolving issues...
When I only connect via Mobile (no Wifi) everything in the browser seems to resolve fine.
If I connect Wifi AND Mobile, DNS in the browser works, but as soon as I call a specific internal self hosted URL with a perfectly valid Let's encrypt Certificate (https://myservice.mydomain.duckdns.org) every DNS attempt fails.
Reset network via System Settings works until I reboot the phone.
If I only use a Mobile connection and use Wireguard to VPN into my home network without any Wifi, everything works fine (including the https://myservice.mydomain.duckdns.org, which is only available via VPN - not public).
Using another Pixel 4a Phone (with stock os) everything works as expected. DNS via Wifi works as expected....Is this a known problem in Graphene OS? What can I do to solve this?
This is really a dealbreaker since I can't use my self-hosted services via Wifi... maybe IP based service usage will help, but there is no SSL and not very convenient.