Web video on Twitter crashes and causes page to reload

Originator:recordtronic
Number:rdar://FB9101410 Date Originated:
Status:Open Resolved:
Product:Safari Product Version:Version 14.1 (16611.1.21.161.6)
Classification:Crash Reproducible:Yes
 
Playing the video embedded in the tweet (https://twitter.com/CNBCTechCheck/status/1391781961237159936) causes Safari crash about half way through the video.

- Paste https://twitter.com/CNBCTechCheck/status/1391781961237159936 into Safari address bar
- Play video 

Expected: Video plays to end
Actual: Web page reloads “because a problem occurred.” 

There is a crashlog for a webkit renderer.

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