Hello.
When add video in "All videos layout" by pressing "Add video" button, use "Enter" button in description, it works OK. As result description display few lines of tesxt.

But when I add video in stream (or edit video's description in stream) and use "Enter button" and save it, as result video's description display all text in one line.

1) add video to stream
2) use enter button to create 2 lines (paragraph) of test.
3) save it.
Result. Description looks like:

First line text.Second line text

without space or / next line. In video's page it looks the same.

But if navigate to video's page (not stream item) and edit it, and save, description will looks normal.

Thanks.