Summoning an item display with a zero stack size succeeds but produces an error in the log

Assuming no misconfigured resource packs are present, in-game actions like these really shouldn’t be producing errors. The fact that this appears probably isn’t a good thing.

Perhaps invalid stack sizes should be set to 1 (if they aren’t already) rather than trying to specifically go out of your way to try and render a stack with an invalid quantity value?