I know that a team that develops "rich editor" in Google Calendar is nothing more than a bunch of idiots and ignorants.
I know that there are nasty bugs that changes content that you put there each and every time you save an even. Bugs that remains un-fixed for years.
I mean... pushing unfiltered HTML content into server and then getting it (again, unfiltered) back to mobile device? This is something I wouldn't expect to happen even among Google Devs Ignorant Team.