Windows 10 Home (64), Brave 0.13.4, Samsung 9 Plus laptop
If I right-click on a bookmark in the bookmarks toolbar, then select “Edit Bookmark…”, the bookmark editing popup does open, but the current tab is opened to the bookmark you are trying to edit. Editing a bookmark should not open that bookmark, merely edit it.
As far as I can recall, this is new in 0.13.4.
Hope this helps.