map.LoadLayerOptions not working with database

As mentioned here: https://github.com/MapWindow/MapWinGIS/issues/109

I have a PostgreSQL layer successfully loaded into the OLE map control but can't load the style data stored from the mw_styles database table. The table exists and has a style record. I have turned on PostgreSQL statement logging and no mw_styles select SQL statement is being run.

My Powerbuilder code looks like this:

li_handle  = ole_mapwindow.Object.AddLayerFromDatabase(ls_conn, "SELECT * FROM nz_primary_parcels_nztm limit 500", true)
ole_mapwindow.Object.LoadLayerOptions(li_handle, "nz_primary_parcels_nztm", "")

But LoadLayerOptions returns false.