I had the same thing as DocSun experienced on Feb 7, 2019 @ 11:55am, where adding the dice to an existing game through 'Additive Load' would not have the card updated with dice throws. Loading it up by itself worked. It could be since most of the script occurs in the Global script instead of the dice tray, and I'm not sure if the global script is transferred during 'Additive Load'.

I have tried modifying the script to work with the tray and it seems to work, but occasionally has an issue on load so I had to add a button to allow the tray to re-initialize. If you want I can send you my altered scripts...however I have added my own features to the scripts as well.