The furnace cannot smelt armour.
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It looks like this is a bug, but is it in the furnace, the armor, or the bow? One by one, please try substituting a different piece of armor (such as an iron helmet), a different fuel (such as coal), and a freshly made furnace, and tell us if anything changes.
Thank you for your report!
We're actually already tracking this issue at MCPE-42533, 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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It is damaged?