Different browsers have different requiremens on playing videos. The situation you described works in Firefox but doesn't work in Edge and Chrome. We can only say it's by design in chromium. But for why, it's not documented. I think only the product team can explain, so I suggest you can provide feedback to Edge team by pressing Alt+Shift+I in Edge. But as the issue is marked as "won't fix" in chromium, I doubt if there will be any change in Edge.
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Regards,
Yu Zhou