When an server is created with an IPv6 address like this:

ipa-server-install -U -r ${HOSTNAME^^} -p password -a password --setup-dns --no-forwarders --selfsign --ip-address=fe80::5054:ff:fe29:a798

The install has no way to caluclate the proper reverse zone, and so we make an arbitrary decision. The command line should accept Address with the netmask appended like this:

--ip-address=fe80::5054:ff:fe29:a798/64

Which would support a 64 bit long reverse zone.