My sword that has pulsating iron, has this feature that tps every mob it attacks, well when i attack a portal, well it tps the portal but the place it teleports the portal becomes invisible and stays as a visual bug in the place it was hit.

Not much I can do other than removing the Vanishing trait, which I don't want to do.

I dont know if it can happen but, the ender dragon is not affected by this sword so there must be a way to filter the tps form vanishing.