ssh / bind help?

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 Hello guys,
I have 5 machines in a home network, all running F9, with named/bind providing local DNS. A couple of weeks ago a problem appeared: ssh hangs for internal connections. No doubt I had misconfigured the thing years ago, as bind mystifies me, but an update must have triggered it.

The problem is that reverse lookups hang forever; here is the end of "ssh -vvv XXX"
debug1: Next authentication method: gssapi-with-mic
debug3: Trying to reverse map address 168.254.0.251.
Note the 'dot' at the end.
If I try nslookup 168.254.0.251 it works fine, but 168.254.0.251. does not.

Can anyone suggest what I am doing wrong? Here is named.conf, in case that helps.
Thank you!

acl ashenden {
   168.254.0.0/24;
};

options {
   allow-query {
   168.254.0.0/24;
   localhost;
};

listen-on port 53 {
        127.0.0.1;
        ashenden;
};
   listen-on-v6 port 53 { ::1; };
   directory     "/var/named";
   dump-file     "/var/named/data/cache_dump.db";
       statistics-file "/var/named/data/named_stats.txt";
       memstatistics-file "/var/named/data/named_mem_stats.txt";
recursion yes;
};

logging {
       channel default_debug {
               file "data/named.run";
               severity dynamic;
       };
};

zone "0.254.168.in-addr.arpa." IN {
   type master;
   file "168.254.0_0.db";
};
zone "ashenden." IN {
   type master;
   file "ashenden_0.db";
};
zone "." IN {
   type hint;
   file "named.ca";
};

include "/etc/named.rfc1912.zones";

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