When go checkout,Cart Price Rules 25%test coupon code can go wrong

[michaeldyl520]

Preconditions

1. Magnto2 CE 2.2.0-dev
2. PHP 7.0.12
   3.MYSQL 5.7

Steps to reproduce

1. add cart price like this
   
2. then go frontend,add a product,then go checkout and payment,that can get wrong

Expected result

1. go normal

Actual result

This is a bug?
How can I fixed it?

[vityakopin]

Internal ticket MAGETWO-70198 was created.

[misha-kotov]

@michaeldyl520 is this issue caused by the special character in the coupon code? specifically %