Nightly builds using wrong version prefix

Looking at https://packages.gitlab.com/gitlab/nightly-builds, I see filenames such as gitlab-ce_8.0.1+XXX. Should these be on 8.0.4 now? Where does the nightly build get this version? VERSION is set to 8.1.0.pre in master, and 8.0.4 in 8-0-stable.