Hello,
It may have been accidentally deleted by the recording user. Check the recycle bin of the user who recorded the video (https://learn.microsoft.com/en-us/stream/portal-my-recycle-bin)
Then check the recording user and see if the recording is turned off. The user should stop recording to get it ready
Please mark as "Accept the answer" if the above steps helps you. Others with similar issues can also follow the solution as per your suggestion
Regards,
Manu