This bug occurs when a horse armor is painted in a cauldron. It is annoying that you paint the armor and it does not look like it should.
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Thank you for your report!
We're actually already tracking this issue at MCPE-40124, so we will resolve and link 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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This has been fixed in 1.11 beta