You can create iron armor that is stronger than any other armor in the game, in other words, it is endless. Also it doesn't have it's icon in inventory, it's gone
Link to video footage where I showed everything in detail: https://youtu.be/ZYOd7QmEngE
Step by step to do this bug:
write this command "/give @p iron_chestplate 2 30000"
combine this two iron chests in a grindstone
dress up this chestplate and test, it's really unbreakable
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I almost always have a crash when trying to take an item with Shift+Click. Also, to reproduce, you can combine armor in the Crafting Table.
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We're tracking this issue in MCPE-184732, so this ticket is being resolved and linked as a duplicate.
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