rax20 not sending correct hostname in dhcp requests

Using rax20 as access point, letting main router assign and IP.

However when it registers it's sending "RAX20" as the hostname, so my dhcp server is using that name, not the device name I've put into setup.

This is an issue because I have two rax20's and the second gets no name assignment at all (because it collides with the first router.

Seems like a bug to me, or is there some hostname setting buried in the rax20 settings I am not finding?