Thank you for the update :Mark. I can now reproduce this on Nightly by closing and re-opening a couple of times.
Bug 1821701 Comment 9 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Thank you for the update :Mark. I can now reproduce this particular issue on Nightly by closing and re-opening a couple of times.
Thank you for the update :Mark. I can now reproduce this particular issue on Nightly by closing and re-opening a couple of times. __Update__: The issue is actually closing the related tab