Why Preview sometimes won't work till after a post is posted?

[bob012345]

Preview sometimes won't work till after a post is posted. I can't see if it's right till after I post it. Why is that?

 

[bob012345]

OK, I see it's a well known bug.

 

[Wrichik Basu]

OK, I see it's a well known bug.

Added your thread to my list.