Automated triage: Not a bug
Thank you for reporting this issue. This report is from an old version and nothing recent confirms it still happens. The lightbox has since changed how it handles keyboard focus and how pop-up dialogs such as the link dialog appear over it. If you still can't paste links into lightbox comments on the current version, please open a new report with the steps and browser you use.
This is an automated assessment. A member of staff may review and update it.