Embedded document .save() not persisting

See gist: https://gist.github.com/xizhao/6ba5bc02229ba0e8eb48

When I try to save Child it passes with no error and looks like it saved, but it doesn't persist in the db.

I am pushing data to an array in the embedded schema via a method bound to the embedded schema. markModified does not help. Using doc.__parent.save() does work, however.

Start with the reproduction in the linked gist and compare saving the embedded Child with saving its parent via __parent.save(). Trace the embedded schema's save behavior and markModified usage, then add a regression test showing whether array changes persist after Child.save().

Written by the indexing model from the issue text.