In at least a few of the cases it looks like the last thing which occurred before the crash was the server testing the Intel Quick Sync Video API (for hardware accelerated transcoding):
Apr 19, 2020 21:27:50.430 [13092] DEBUG - Codecs: testing h264_qsv (encoder)
Apr 19, 2020 21:27:50.430 [13092] DEBUG - Codecs: hardware transcoding: testing API qsv
You could do a quick test to see if Plex’ use of QSV is causing issues by (temporarily) disabling hardware acceleration: Settings -> Transcoding -> Use hardware acceleration when available.
Though, if that were the issue, I’d really expect it to crash on all transcodes attempting to use it.
