When I have Stardust Synchron in hand I receive a message saying " ?: -1: attempt to index a boolean value" and I am not able to tribute summon stardust synchron by its effects either in hand neither in GY.
The error code appears immediately after I have any monster on the field that can be tributed to summon stardust synchron.
Screenshot OR error code
What OS are you using
Mac OS Ventura