https://foo.tailf123a.ts.net {
	bind tailscale/foo
	reverse_proxy localhost:3000
}

https://bar.tailf123a.ts.net {
	bind tailscale/bar
	reverse_proxy localhost:5000
}

Two domains are declared in the previous caddyfile. After starting caddy, only the first domain I visit will resolve correctly. The second one will never resolve. For example:

1. Start caddy.
2. Go to https://foo.tailf123a.ts.net
3. Caddy does its tls thing and I'm able to connect.
4. Now go to https://bar.tailf123a.ts.net.
5. Caddy this time tries to do a http-01 challenge. This always fails. We are unable to connect https://bar.tailf123a.ts.net.

If we restart caddy, and visit https://bar.tailf123a.ts.net first, then it works. But then we can never conenct to https://foo.tailf123a.ts.net because that will do a http-01 challenge which fails.

If we declare 3 tailscale https domains in the caddyfile, the first one we visit will resolve correctly and the other 2 always fail.