貼文的作者是 Joseph Rézeau

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This is a well-known bug in the latest version of Moodle 4.3. See this bug report: MDL-79937 for which there a fix that I have tested and it works, but it may take some time for the fix to be made available in Moodle.

I encourage you to vote for this bug report.

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"Could it be that when you add a rose feedback output and no questions are added to the specific question feedback, this error occurs?"

Yes! I've been able to reproduce this. But... why would you do this (no questions are added to the specific question feedback)? 

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The fact that those videos are freezing may depend on many factors other than being part of an H5P content: the quality of the students' internet connection, the length of the videos, their encoding, etc.
Try this: take one of those videos that is inside an H5P interactive video content and just put it on a page in your Moodle course and ask the students to view it and report any problems.