Pulling git tags from multiple sources incorrectly reports stale tags

From: Christian Goetze <christian.goetze@appdynamics.com>
Date: May 19, 2016, 23:25 UTC
Message-ID: <CACuwOqNZC3NipCVJ5YbTA_0d-P+i2KmQ5V2HzYPhZFQn4Kuwkg@mail.gmail.com>

See https://gist.github.com/cg-soft/62ac3529cf9ad6f6586e07866de43bc4 and discussion here: http://stackoverflow.com/questions/37330041/merging-git-tags-from-multiple-reference-locations

Essentially, using this git config to pull tags from multiple remote refs works fine:

[remote "origin"]
    url = /Users/christian.goetze/git/tag-merge-demo/origin
    fetch = +refs/heads/*:refs/remotes/origin/*
    fetch = +refs/private/tags/*:refs/tags/*
    fetch = +refs/tags/*:refs/tags/*

But this, leaving out the last line,  doesn't:

[remote "origin"]
    url = /Users/christian.goetze/git/tag-merge-demo/origin
    fetch = +refs/heads/*:refs/remotes/origin/*
    fetch = +refs/private/tags/*:refs/tags/*

I would expect either to work the same way.