The git repository seems to be missing the branches and tags that were in the svn version. Would it be possible to add those in? This probably doesn't need to hold up the pull request as adding extra branches and tags shouldn't affect existing hashes.
They are supposed to be there. They must have gotten lost somewhere. I'll try to find them.
I'm following the tutorial at https://www.atlassian.com/git/tutorials/migrating-convert. (I'm ignoring offensive comments such as "'git svn' is a great tool that makes converting from svn to git simple.") The respective script creates git branches and tags for all svn branches and tags, but then deletes them again right away. The script is written in Java and distributed as binary.