Rather obscure bug that most people haven't seen because they are modifying the title with plugboards. Fix submitted.
Workaround 1: use jackie_w's suggestion. Create a custom column containing {#disporder_index:0>5.2f} and then set up a sort rule
Code:
sony_collection_sorting_rules=[(['#disporder'], #what_you_named_the_column)]
Workaround 2: wait for the release.
