Again one of those little UX things:
If you enter a name for a class or process that starts with a number, simply nothing happens. Unless you know that there is this convention, you will just scratch your head why it does not do anything.
The right thing would be to show some sort of error as a tooltip or you know.. anywhere. Just doing nothing does not help anyone.
You just enter the text and think it has changed it. You go somewhere else and realize it has not done anything. As a beginner or person not knowing this you have no way out of this dilemma and will just assume its a bug.
Thanks for considering.