Issue with nested embdedded documents after adding an EmbeddedDocument to Document

I'm using the latest version of Doctrine ODM (fresh from Git).

I have three levels of Documents (Two embedded); Category -> EmbedsMany: Post -> EmbedsMany PostVersion.

Step-by-step:

1. Make a new Post (Post1), 2 PostVersions (PostVersion1 and 2) and a Category
2. Add Post1 to Category
3. Persist Category, Flush, Clear
4. Retrieve Category
5. Make a new Post (Post2) and 2 PostVersions(PostVersion3 and 4)
6. Add Post2 to Category
7. Flush

If you're following properly, at this stage in the database there should be:
1 Category,
2 Posts
4 PostVersions ... 2 PostVersions in each Post

However, what actually happens is:
1 Category,
2 Posts
4 PostVersions ... 4 PostVersions in Post1, 0 PostVersions in Post2

On StackOverflow: http://bit.ly/ekFbe2
Testcase Gist: https://gist.github.com/920914

A work around is to make Post2 and add it to Category, flush, then make new PostVersions and flush again.

I did some debugging but I don't know enough about the internals to fix the issue.