I am glad to report that from now on, Facebook post embedding works. You know Facebook links vary, it may happen some kind of links won't display, but the 100% method is:
- click the the three dots in the upper right corner of the post
- select embed
- click the blue facebook icon on the right below the button: copy code
- the post url will open
- copy the link of the post, insert it here
- delete the "?ref=embed_post" tag from the end of the link
Know it is a bit complicated, but Facebook uses so many type of links that the forum cannot handle all, only the original basic link.