server can't find XXX.in-addr.arpa: NXDOMAIN

Your other machine does not magically know that it should ask your nameserver about 1.10.168.192.in-addr.arpa. It will ask a recursive resolver (or possibly recurse itself) to resolve the name for it starting from the root, and that recursion will tell it that all of 168.192.in-addr.arpa. is handled by the name servers blackhole-1.iana.org and blackhole-2.iana.org. You can guess from their names what those servers actually do.

If you want that reverse lookup to work, it's not enough to set up a zone for the reverse data you want to provide. You also need to make it so that the machines that should see that information ask your server instead of the global DNS tree.