Stacked item/mob nametags - can briefly show through walls

This may be debatable if it's a bug (haven't given it too much thought until now) but want to be sure this is taken into consideration. The nametags that appear above stacked items or mobs normally don't show through walls, but they do briefly show when a stack is created. This means that if a base has an automatic farm (either that produces items, or stacked mobs), it can potentially give away the base's location, in the case of an underground base, as you can see the nametags appearing.