&# characters in this specific order will always disappear, confirmed in two different Installations
v1.18.2 and v1.18.1

I thought this was an issue with the Rich Text being enabled but the issue actually still happened when I turn off Rich Text. It Disappears on the web portal as well, emails that get sent out. It also gets stripped out from responses replied to via email parsing. Doesn't appear to be anyway to allow it to be posted. I'm not sure if anyone else has noticed this or not.