Writing below folded bug

Testing version: Mac Version 1.0 (2952)

What were you doing: writing

What feature did you use: folding header

What happened:

I folded all the headers and started to press enter below them. I couldn’t see any change so I got confused, then realised they were hidden under the last folded header.

What did you expect to happen:
unfold the last header whenever I start to write without any header that is unfold.