Drag & Drop creation of Bookmark replaces title by url
I cannot select a TorBrowser version, I use 9.0.5, but I observed this years ago already. When you create a bookmark using drag & drop from the leftmost part of the navigation bar (information symbol, lock symbol etc.) the title of the bookmark is set with the value of the url, not with the title of the website.
This does not happen with other "create bookmark" use cases and not in Firefox, so this is probably a bug.