When you put a trimmed armour piece in the hotbar, it 'asigns' the material of that trim to the slot it is in. Then when you put an untrimmed armour piece in that slot it has that trim shown despite it not actually being trimmed (hotbar only)
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Thank you for your report!
We're tracking this issue in MCPE-168358, so this ticket is being resolved and linked as a duplicate.
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This is true but I've alreaady reported it on MCPE-168372