in En_GB, voting on the winning "Month" inherited gives Same as Code error

Go to: https://st.unicode.org/cldr-apps/v#/en_GB/Fields/25a7d97a372ac06d
Add your vote on the winning item.

Actual: error "Sorry, your vote for 'month' could not be submitted: The item is the same as the code." and message in the info pane "Not submitted: The item is the same as the code"