During the wither fight, the wither is supposed to descend to the level of its target at half health or less (when it gains arrow immunity). When I fought the wither the first time on 21w42a in my original world, I got it down to below half health and it was not coming down to my level. However it still gained immunity to arrows making it impossible to kill with a bow or sword when it was below half health. It regened enough health to regain its floating ability and it then I proceeded to reduce its health to below half for a second time and yet again, it still did not descend to my level making it impossible to hit with a sword while still being immune to arrows. (I attached a video where I retested it on a different world also on 21w42a and the same thing still happened).
Environment
Windows 10 x64, Java(TM) Platform SE 8
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We're actually already tracking this issue in MC-239280, so this ticket is being resolved and linked as a duplicate.
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