Just to be safe, I re-created it, starting from scratch in Notepad, re-typing everything in (not copy/pasting anything). Copied from here and pasted into the token. Alas, Microsoft is still auto-formatting it, making it look odd. In case it's helpful, what's specifically happening is that at the bottom of the ics file content I have listed contact information for the two people who will be at the event. It's taking only the first person's name, and making it large, blue, and in a different font/format. I've seen this happen before in Outlook ics files (doing this to people's names) - but always figured the sender was just being sloppy (I take back all of my previous "tsk-ing!" as I now can't seem to make it behave appropriately for us.)
🙂Here's a quick visual example of how it's converting mid-text (all of the above is that black sans-serif... then it hits this section, and Robin's name turns blue, big, and a serif font):