Steps to replicate the issue (include links if applicable):

• Open https://en.wikipedia.org/w/api.php?action=query&format=json&prop=redirects&rdlimit=max&rdnamespace=0&rdprop=title|fragment&redirects=true&formatversion=2&titles=Nairobi
• Look at a redirect like Crime in Nairobi (title) available at https://en.wikipedia.org/w/index.php?title=Crime_in_Nairobi&action=edit
• It should redirect to Crime_and_law_enforcement fragment

What happens?:

fragment value is Crime and law enforcement

What should have happened instead?:

fragment should be Crime_and_law_enforcement

Other information:

It looks like something is transforming the fragment id to something which looks like a title. I see no reason this should be a title, since it is a fragment, hence the id of some HTML element.

But I might miss a good reason to do so.