Hi,
It seems it is not a problem with any specific &XXX; HTML entity, but code editing simply doesn’t work with Cwicly blocks because of a Guntenberg bug, which is a shame and very very frustrating:
(actually NOT FIXED)
Looks like a code block is the solution for now.
But indeed, we desperately need a way to edit Cwicly’s heading/paragraph HTML content for line-break customization. A website looks so cheap when lines are badly broken.