Looks like this line is wrong https://searchfox.org/mozilla-central/rev/3d294b119bf2add880f615a0fc61a5d54bcd6264/dom/base/nsContentUtils.cpp#3482, should be the opposite..but I need to take a closer look to if it made something accidentally work
Bug 1966466 Comment 3 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Looks like this line is wrong https://searchfox.org/mozilla-central/rev/3d294b119bf2add880f615a0fc61a5d54bcd6264/dom/base/nsContentUtils.cpp#3482, should be the opposite..but I need to take a closer look to see if it made something accidentally work