https://test.totallympics.com/topic/198-test/?do=edit uses CKEditor. Couldn't figure out which version, but according to the website's JS it's from 2020: `Copyright (c) 2003-2020, CKSource - Frederico Knabben.`. I suspect the problem is CKEditor-specific.
Bug 1665659 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.
https://test.totallympics.com/topic/198-test/?do=edit uses CKEditor. Couldn't figure out which version, but according to the website's JS it's from 2020: `Copyright (c) 2003-2020, CKSource - Frederico Knabben.`. I suspect CKEditor fills the clipboard itself and I'm not sure if this Gecko-specific functionality can be adapted to be able to deal with this. Need to think about it.