Please see this GitHub issue (did not get any attention in 21 days)
If I set wildcard A record (eq. *.example.com. to some IP 188.8.131.52), it correctly routes all subdomains to that IP, but routes www.example.com and example.com to box’s IP.
Can be fixed by manually setting those two records.
You need to set on the DNS the three options abc.com, www.abc.com and *.abc.com to the ip address of the server your sites are hosted on