I don’t think Tailscale counts as a reverse proxy, but it does support HTTP/3 and QUIC so that suggestion may not apply here. Still, it might be worth double-checking to see if they are disabled. Also, have you tried disabling Tailscale altogether and connecting directly?
Whoa, that is fucked up. They had no empathy for the guy, and the dude was one step away from CEO. Wtf is going on over there? They’ve been making sketchy decisions lately.