Single types beginning with a number incorrectly flagged as not adhering to kebab case

I don't have the exact error in front of me at the moment as I have already worked through it...

But when my single type `30-day-dental-health-challenge` was renamed to `dental-health-challenge` it was deemed as valid kebab-case. I had to rename the `singularName` property and the directory it was in in order to be deemed valid