sys-apps/portage-mgorny stopped using disjoint /usr/sbin and moved all tools to /usr/bin. This makes eclean-pkg fail with: /bin/sh: /usr/sbin/emaint: No such file or directory (also note lack of error handling) Please use PATH lookup like normal programs do.
it is only using the command line interface as a backup now. It is using imported emaint code and running it directly as primary method of fixing the index.