"videoId" parameter is missing in src of the embed, without this parameter src leads to nothing (just check https://players.brightcove.net/5543465120001/H1xhtDScZ_default/index.html?playlistId=&controls&playsinline) which is equal to an empty src. Again, there is no point in storing embed with initially broken src — if you use iframe, correct src is obligatory. It's not a single-case issue, see: https://theblast.com/justin-bieber-struggling-disconnected/, https://theblast.com/dog-chapman-beth-chapman-bounty-hunting-arrest-video/