Currently, nwn-data-1.29-r4.ebuild has PROPERTIES="cdinstall? ( interactive )", and all previous versions do not. This means that if someone were to run: (to avoid interactive installs) emerge -uDavN --accept-properties=-interactive world with nwn-data-1.29-r4 installed, portage will pull in nwn-data-1.29-r3 (as it is not marked as interactive). However, it _is_ actually interactive and portage will wait for user input. Please add PROPERTIES="cdinstall? ( interactive )" to all versions of the nwn-data ebuild. Reproducible: Always
No, you should mask the older versions instead. The old versions will go away completely once the latest version is marked stable.
and in fact I just punted the old versions so you should be all set on your next sync.