@biranit I specially register to say thanks to you! I spent two days on this nonsense. Instagram and Facebook didn’t worked normally for me.
Increasing timeout increases page load time, so be careful with that, it can hit rankings.
Also, oembed cache is 24h, to play with it, some info could help here:
https://wordpress.stackexchange.com/questions/203537/how-can-i-clear-oembed-caches-for-youtube-on-posts-as-they-are-loaded
