This relic causes many projectiles to hover in the air and wouldn't disappear, such as the Ender Dragon's fireballs and the Wither's skulls.So when I was killing handreds of Withers for nether star,the numberous Skulls cause my game to lag more and more.Meybe the way it works needs to be adjusted.

I'm having the same issue. Was fighting blazes for blaze rods for a bit and now i have hundreds of fireballs just hovering above the area my spawner is in... No idea how to get rid of them either, they don't cause damage and vanish if I walk into them, nor can I do anything to them... edit: /kill @e[name="Small Fireball"] got rid of them all.

Took the quantum bubble off because of this, and won't be using it again.

also having this issue. I have an area filled with a few dozen wither projectiles as well as various blaze and ghast projectiles stuck forever in the air.

Same here, it happens with breeze shots, blaze, the ender dragon and the wither (As i had seen)