You are not able to interact with the 'name bar' on the top of the anvils interface, therefore you can't name items.
When I was about to name an item in an anvil I noticed that I couldn't click on the name bar. I after that tried to do it in different game modes and worlds but the result was always that I couldn't interact with the bar.
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duplicates
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NeunEinser
migrated
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We're actually already tracking this issue in MC-173725, so I've resolved and linked this ticket as a duplicate.
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