I just recently submitted an answer written in the new editor that contained an email:
After I posted it, I clicked 'edit', switched to rich text mode, made some changes and submitted my edits. However, the email became a link:
For some reason, I suspect this is a bug...
When I write in CommonMark mode, this doesn't happen.
Note that I can't even remove
mailto in the new editor... I can only remove it by switching back to CommonMark mode.