Empty row required after last sentence inside a header

Testing version: 1949

What were you doing: wiring notes

What feature did you use: collapsing headers then press enter under the header beneath the one I have collapsed

What happened: The enter has made the first paragraph of the collapsed header appear next to it, and once I pressed enter again, it became part of the header, seems like all notes below that been erased

What did you expect to happen: an empty space where the cursor is.