I'm unable to reproduce this on 2.176.2. I created a job with the snowman emoji in the name and it worked fine. I was able to edit the configuration and everything.
I was about to say that it was a newer emoji, but it appears as though it's not new at all. Strange.
I know that we use XML 1.1 instead of 1.0 in order to allow for better Unicode support, though that's likely irrelevant here unless you're trying to use an emoji in an XML tag name.