Yes. We’ve definitely seen the “Incorrect string value:” error associated with this before. In one case we tracked it down to emojis in the section title (see Emoji in subsection title not supported since Nutmeg) but I don’t think that’s everything we’re facing.
FWIW, I’ve tested similar content on edge.edx.org and it works fine, so it seems like it could be an issue with our MySQL configuration, and apparently, with Tutor’s as well?