Infinite withers in the end

I was killing withers in my end dimension on my realm. (Of course due to the insane difficulty of a bedrock edition wither I was doing them one at a time). One flew up maybe 200 blocks or so and i left the end to get more milk buckets. I come back it comes back down and I kill it. For some reason every time I enter the end now the wither spawns again ive killed it three times but it keeps spawning. It keeps destroying the dragon island and I do not enjoy it. there is always only one so they never multiply at once. This could be an exploit so I think it should patched. It probably has something to do with the game trying to remember it being there but also being out of render while changing dimensions. I dont know, there is no way to show a picture because all you would see is the wither and i dont think that helps much hahaha... Thank you. For taking the time to read this and I do hope it gets patched due to its destructive nature.