Comment 28 for bug 711305

I reported first seeing this problem three years ago after upgrading to Fedora 31 with Firefox 75.0 and Thunderbird 68.7; but at some point, for sure by Fedora 35, the problem for me had disappeared. I just assumed they had fixed it, either intentionally are as a side effect of some other change.

I'm currently on Fedora 37 with Firefox 109.0.0 and Thunderbird 102.7.1 and haven't seen the problem re-occur after installing Fedora 35. If you are on Fedora 35 or later and seeing this problem, it has to be something perhaps unique to your system, like some combination of configuration or account settings, or a timing issue that is affected by hardware speed, etc. It definitely doesn't affect all users of Fedora, which makes it a difficult to fix if the conditions to make it occur on other systems are unknown.