Leon indicated best practice and he is right there. It avoids
many problems, not just this one.
I don't see how that is preventing you though if you must use
very long titles. When you add to related topics, the window shows
first the topic name and then the bookmark. There is a slide bar at
the bottom
Using that, you can see the topic title and the bookmark
name.
Yes it is more awkward but that's an own goal.
Help others by clicking Correct Answer if the question is answered. Found the answer elsewhere? Share it here. "Upvote" is for useful posts.