Can you check if that change behaviour?, or is this full gl-inet firmware?
my wg servers are dockers on different servers in different locations. These work correctly since they have several clients each working well.
You said that ping etcetera worked, but not a website this seem to be a issue i also had not so long ago.
I have not talked about web because it seems simpler to analyze this case through ping and traceroute.
Smells like DNS error.
Regarding the DNS, it works correctly and in my opinion it is not very relevant here. The DNS resolves correctly, in fact the ping is being resolved by DNS.