Artifact links don't direct you to the correct sub-title

Some artifact links that I came across were not directing me to the correct part of the article. It seems that the sub-titles do not have the ids that the links are looking for. 

e.g. 
link: https://bips.dev/77/#backwards-compatibility found here https://github.com/bitcoin/bips/blob/master/bip-0077.md#mailbox-endpoint

correct sub-title: https://bips.dev/77/#Backwards_compatibility