This potentially will make the deep dark too easy for those who know it works like this. Currently snowballs landing doesn't alert shriekers no matter what as well. In my opinion, that can stay. I feel like this is just a side effect of the game currently not taking note of whether or not a player dropped an item or if it happened by other means. If Mojang has not considered this behavior yet, I'd hope they at least would talk about it even if this ticket gets closed as WAI (which in my opinion it might).

Proposed fix is that if a player drops an item, the first time it hits the ground, it produces a vibration that alerts shriekers. Any other time, it wouldn't produce a vibration that alerts shriekers.

Video: https://youtu.be/B4J_lJIDD9U