Version

3.0.2

Reproduction link

https://codesandbox.io/s/transition-leave-bug-evexs

Steps to reproduce

https://codesandbox.io/s/transition-leave-bug-evexs

What is expected?

When trigger leave, the font color should translate from red to default.

What is actually happening?

1. Properties in class *-leave-from not work.
2. The class *-leave-from affects the normal operation of transition component.

The reason is related to the process of adding/removing css-class, i would like to fix it.