found a #cool item-deletion bug with the Packages inventory-interaction stuff because i checked slot.getMaxStackSize()
instead of the max stack size of the item itself.
not much of a problem in 1.20 because most containers return 64 from this function. but because of the ✨ data driven ✨ stack sizes mojang added, slot.getMaxStackSize now usually returns 99 ! and that exposed the bug better