Currently, autofs only performs NFS mounts reliably if the IPv4 address of the
server is used.
 * If the server's hostname is used and, that resolves to an IPv6 address then,
the NFS mount never completes -- it hangs.

There's this Debian Bug Report #737679:
"autofs does not appear to support IPv6 hostname lookups for NFS mounts"
<https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=737679>

This seems to be resolved with autofs 5.1.5.
 * Which available with Tumbleweed and the Leap 15.1 "filesystems" repository.

Is it planned to make autofs version 5.1.5 available for regular Leap 15.1 and
Leap 15.2?