Plus signs getting eliminated from polls?

I see this was an issue waaaay back in an old version (https://community.telligent.com/community/archive/f/developer-forum/1073607/plus-sign-in-unfiltered-html-widget), but we're noticing in 11.0. Plus signs (+) are filtered out of polls. They work just fine in all other content editors we've tried, but not in polls.

Is anyone else seeing this? Can we fix it?