This issue is about timing. Apparently not everything is initialized correctly when one is fast enough. Our automatic tests found the issue as it is fast clicking. One can reproduce it locally when trying hard.

1. http://localhost:34641#elytron
2. put mouse cursor on Edit link. Prepare for click
3. F5
4. Wait for rendering Edit. Cursor is on correct position where Edit will show.
5. Imediatelly when Edit is show - Mouse Click.
6. Internal Error 
  TypeError: Cannot read properties of undefined (reading 'vcb')