In the Minecraft BE version (Switch), in the survival world, summon and destroy the wither at the end, save and exit, return to the title screen, enter the world again, and go to the end, the wither revives with half the HP did. Reappears even if the difficulty level is changed to normal and returned to normal. Even if you kill the resurrected Wizard, it disappears at that time, but it appears again when you enter the end. It will come out even if you kill it. After defeating it, Nether Star comes out properly.