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In PTR(RR) records SOA bug #176
This functionality is designed to allow the user to have the domain name automatically appended to the master server and email address, so this is not a bug in itself as the SOA in your example is supported by BIND. However, even though this is not necessarily breaking any RFC's (best I can tell), reverse zone SOAs really shouldn't append the domain by best practice. I'll consider removing the option in v2.0.