Not seeing any tweets embedding today, and this time I'm pretty sure it's not just me leaving a tracking blocker on as I have seen at least one other person mention it. I am not sure if it's affecting everyone or just some people.
They just leave empty space in the post like when a tweet gets deleted or you otherwise put a twitter link in to a tweet that doesn't exist.
*sets alarm for 1:50 PM tomorrow*
and yes I definitely made sure the tracking protection thing that did this to me last time was off. Firefox 63.0 in windows 10.