I tried everything. Accessing tailnet hosts via browser, accessing the internet via exit node, taildrop, ICMP ping, “tailscale ping” and “tailscale ping -tsmp”. Only the “tailscale ping” variants tell me any packets can move.
i and many more have the same problem. it looks like an error with the dns resolution when you are connected with 4G/5G and have tailscale running.
In Tailscale admin console, enabling “override local DNS” fixes this issue but this will force override the DNS settings on all your tailscale clients.
It seems to be isolated to the apps though, in part at least. An app like nextcloud, mattermost, traccar…those will not work when connected to Tailscale and on 5g, but the same hostnames resolve fine via Chrome, and the DigDNS App. Conversely, everything works fine on Wifi.