Opening a new issue to track this error.
The failing test seem to be TestMDNSHandler_Apple in handlers/dns_naming/mdns_test.go.
The test code didn't change since v0.4.0 (which passes), so I assume some other change in the code has caused this.
It will take me some time to get deeper into the codebase to figure this out.
Originally posted by @paskozdilar in #16 (comment)