Resolution: Cannot Reproduce
I have a post that has a reference to a subcategory
When i made my post versionable="full", the current and old versions of post lost this reference.
So when i call $post->subcategory i get back a Generic ODM document instead of a Subcategory Document
I know that relationships are not versionable, but relationships should at least still exist.
The workaround is to get the parent path and make a JCR-SQL2 query to fetch the subcategory document.