Hi @CaptainTime Thanks for letting me know. I am able to reproduce the issue on HubSpot with a styled snippet. We will look into this and let you know if there's a fix for this.
Note that empty line issues are not unique to the desktop app. We have similar issues in the Chrome extension. See this thread for example: Hubspot chat and email: missing empty lines. It seems we need to do a deep dive into newline issues with HubSpot.