Not sure if intended feature, but when creating a BUD switch, it can be set off by placing a redstone object (repeater facing piston, torch, Redstone dust)  on the ground one block distant from the piston, which theoretically should not have any power or set off a detection. With any other block, the switch is not set off, but it is with a redstone item. https://youtu.be/yYY6a8_g5sM this video shows me performing it, and its reproduceable in all of the versions I have tried it in so far that have slime blocks. Is this intended?