still having trouble with VCS plugin change bars

I must have broken something in my VCS plugin that I am writing.... The change bars show up in the gutter when editing, but disappear when I save the file (in theory, that shouldn't happen until the user commits the file). I have spent a lot time making sure that my ChangeProvider.getChanges() & ContentRevision.getContent() methods work as intended. My ChangeProvder.isModifiedDocumentTrackingRequired() always returns true.

I am stumped as to why the state resets when the user saves the file..... Any clues on a direction to debug would be appreciated!