htt's home dir should not be in /home - causes oddness in autofs setups on upgrades.
Maybe change the useradd command parameters in the spec to: /usr/sbin/useradd htt -d /usr/lib/im -c "IIIMF Input Server" -r -s /sbin/nologin -M >/dev/null 2>&1
Yeah, using -s is the way to fix it. Thanks.