From my observation, there are two problems, (1) on certain situation, our eviction algorithm fails after seeking back to the start position, which causes the buffered data won't be clear properly so that appending would raise an ` NS_ERROR_DOM_MEDIA_SOURCE_FULL_BUFFER_QUOTA_EXCEEDED_ERR` (2) when Youtube noticed that error, they would try to assign a new source buffer to the media element, which also happens in bug 1760529 as well. Youtube player seems not being able to handle this case properly, so it doesn't update the current time of the player and not keep appending the data.
Bug 1904937 Comment 4 Edit History
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From my observation, there are two problems, (1) on certain situation, our eviction algorithm fails after seeking back to the start position, which causes the buffered data won't be clear properly so that appending would raise an ` NS_ERROR_DOM_MEDIA_SOURCE_FULL_BUFFER_QUOTA_EXCEEDED_ERR` (2) when Youtube noticed that error, they would try to assign a new source buffer to the media element, which also happens in bug 1760529 as well. Youtube player seems not being able to handle this case properly, so it doesn't update the current time of the player and does not keep appending the data.