When the wither boss shoots it's bombs into the air and don't hit anything they just leave the loaded area and then get cought in the none loaded Chuncks forever. I was flying around and found around 30 wither boss bombs just flying forever. You can just follow them and they never despawn.
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I also noticed this. You are able to push them in any direction like you can do with ghasts fire balls.
Griefers could exploit this bug, by AFKing next to a wither cage. When the chunks load, the wither skulls could overload, or even crash, the server.
if you are bad at fighting the wither, there will be many wither skulls and lag your world! PLEASE MAKE THEM DESPAWN!!!!!!!
A work around is to do the fight deep underground (like in a big cavern right above bedrock) then the skulls don't get free. You've still got to deal with lag from the broken blocks but at least those will despawn
This also applies to ghast fireballs. I created a ghast blaster for a tree farm, and sometimes the fireballs were redirected by moving logs. The fireballs escaped my blast area, and flew off into the distance. Only noticed the plethora of non-despawning fireballs after flying away from the area after an afk session.
Edit: See attached video of coming across escaped fireballs while flying away from the blast area. Open fullscreen, and carefully pay attention to the beginning. There are many free flying fireballs that don't have a flame animation.
This problem also showed up in a server I play very recently. And its causing server crashes. We fought about 8 withers consecutively on an End Island and now because there are so many skulls flying in every direction its crashes the server the moment we try to spawn another. Skulls NEED to despawn.