This is an interesting feedback comment that came from the Hebrew Wikipedia and I managed to also replicate in the English Wikipedia.

Steps to replicate:

1. Go to a Sandbox page under a username. For example, this page https://en.wikipedia.org/w/index.php?title=User:Mooeypoo/Sandbox&veaction=edit

2. Mark one of the words and add an existing page to link to it. For instance, I marked 'some' and chose the link to "Somerset".

3. Inspect the link while still in VisualEditor - the link is under the user namespace, so in my example, the link is now "https://en.wikipedia.org/wiki/User:Mooeypoo/Somerset"

4. Save the page.

5. After save, the link seems fine (points to https://en.wikipedia.org/wiki/Somerset as it should).

Version: unspecified
Severity: minor
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=59196