organic chemistry - Why was the definition of chiral carbon changed?

Before 1984, the definition of chiral carbon was,

carbon atom that is attached to four different types of atoms or groups of atoms

In 1984, the definition was changed to

Any carbon molecule that is not superimposable on its mirror image.

Why was this change made? Don't both definitions mean the same or is/are there cases where the former is false. Preferably, please provide an example