As of 1.13.09 anvils can no longer be used to repair tools with their material. They can still be used to combine tools.
Linked issues
duplicates 1
Comments 4
Thank you for your report!
We're actually already tracking this issue at MCPE-51180, so we will resolve and link this ticket as a duplicate.
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Tested with enchanted diamond tools on both a slightly damaged anvil and brand new anvil.