Shulker projectiles sometimes don't despawn

I have these too, they just stay put and you can even walk through them as if they weren't there at all.

i did find out that you can just hit them and they than go away

Still this could cause lag on server's due to them being entities.

it is also in 15w31b

i know why now try /gamerule doMobSpawning true

Still in 1.9.1-pre1

Still in 1.9.1-pre3

Still in 1.9.3-pre2

Is this still an issue in the most recent versions (currently that is 1.11) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time. If you are the owner/reporter of this ticket, you can modify the affected version(s) yourself.

Marked it as fixed, because original issue ("When a shulker is killed it's attacking particles are left behind") was already fixed