I’ve added data to the spreadsheet property 2 different ways: as a property attached to a piece and to a Prototype for a piece. Neither record the data when the piece is accessed on the map (yes, I have refreshed the game/map to incorporate changes). Interestingly, when I right click to view the piece in the editing window, I can see the data is stored
On review, the problem might be the refresh capability. I have a number of charts as Maps. The refresh of the Predefined setups doesnt seem to apply to anything that is set up on these Charts/Maps.