Sometimes player loads with no video

Sometimes a YT player will appear and if you try to hit play you will get an error. Once you get the error there is no alternative than to refresh, adding a video does not clear the error.

Start by reproducing the YouTube player failure described in the issue: a player appears without video, play shows an error, and adding a video does not clear it. Trace the player and error state through the frontend entry points, then verify that loading a video recovers without requiring a page refresh.

Written by the indexing model from the issue text.