Armor is not visible on the wither skeleton. Tried all game difficulties with no fix. It works with other mobs, but not this one.
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Thank you for your report!
We're actually already tracking this issue at MCPE-44488, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Affects version 1.16.0.51, where Wither Skeletons can pick up and wear armor but it does not show up