path 自定义箭头 d 会影响 path 的路径

[Yanyan-Wang]

• [ ] I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

https://riddle.alibaba-inc.com/riddles/ffd385c7

Steps to reproduce

path 自定义箭头 d 会影响 path 的路径，L28 与 L37 中的 d 如果注释掉就不会影响 path。

What is expected?

path 不受影响。

What is actually happening?

path 变形。

Environment	Info
g	3.4.7
System	Mac
Browser	Chrome