RTE - hard returns make BRs instead of Ps

I was doing some RTE testing on https://da.live/canvas#/aemdemos/ise-boilerplate/index with the 'layout' open in the Experience Workspace and noticed:
- a hard return creates a BR element instead of a P the way other editors do
- a soft return (shift + click) does nothing, instead of making a BR element the way other editors do

Test page: https://main--ise-boilerplate--aemdemos.aem.page/
I let Adobe folks have authoring rights so you can check it out.

Reproduce the issue in the Experience Workspace using the linked test page, with the layout open, and inspect the generated DOM after a hard return and a Shift-click soft return. Done means hard returns produce P elements and soft returns produce BR elements, matching the behavior described for other editors.

Written by the indexing model from the issue text.