Markdown hard break breaking the editor

[gzuidhof]

The rich markdown editor can't handle hard breaks in Markdown, that is: a line of text that ends in two spaces followed by another line of text. You will run into this when opening a notebook with markdown content that has such a line ending, or when using the raw editor.

I am guessing that the issue is that markdown-it and prosemirror use different tokens? hardbreak vs hard_break