I've just been playing on a friends world and there's invincible mobs I can't kill either with sword of /kill? With my sword they set on fire for a split second then go back to how they were as I have Fire Aspect. I think it's kind of acting like the NoAI option on Java.
video: https://youtu.be/xvHlyDdi6vs
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Can you upload a video of this happening?

I have attached a youtube link as the video was over 10mb

I'm having the same problem with a zombie that picked up a bone. Iron Golems have waylayed it. I've hit it with my sword multiple times. In this attached video clip, he's been swimming in lava. Nothing can kill it.
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This is one of the things that happens with MCPE-147391, so I'm resolving this report as a duplicate.