Automated triage: Not a bug
Thank you for reporting this issue. This report is old and nothing since has confirmed it. The gap also depends on one exact padding value and on the machine, which points to how the browser rounds sizes at certain display scaling rather than a fault in the navigation styling. If you still see it on a current version, please open a new report with your display scaling and zoom level.
This is an automated assessment. A member of staff may review and update it.