Bookmarks and Shortcuts
i use Vivaldi Snapshot 1.10.845.3 (32-Bit) on Windows 10 Enterprise LTSB.
I've found a bug, when I use Bookmarks with Shortcuts. When I type an URL in the address bar, which is the same URL in a bookmark and use autocompletion, then I get an search with the shortcut from the default search.
I have a bookmark "http://www.vivaldi.net" with Shortcut "v"
When I type vivald.... in the address bar and use the autocompletion with bookmarks then I get a google search with "v" (https://www.google.de/search?q=v)
Yes, your issue is known, address field completion fixes are in progress.
I tested with F2 and shortcut works nice.
Generally the shortcut works correctly, whether in the address bar or with F2.
The error is different when I enter the URL (of a bookmark with shortcut), Vivaldi calls the shortcut text. Because the shortcut is not a valid URL, it then calls the default search
I tested your example with v and www.vivaldi.net and it works for me.