Downloaded dev version doesn't include last commit

Downloading imagecache_token-7.x-1.x-dev using Drush, or using the download link on the project page, pulls a file that does not include the last commit from the git repo. The version that downloads is labeled as 7.x-1.0-rc1+5-dev, but there have actually been six commits since RC1.

I discovered this after trying to apply the patch from #2582497: Confirm 'mimetype' token works as intended and having it fail. When I looked in the repo to see what had changed since that patch, I found that there were no new commits, but rather the patch was expecting an old commit that wasn't there.