Abnormal behavior when inputting Chinese in the input of void element

[Guan-Erjia]

Description

When I inputting Chinese in the input of void element
It will insertText on onCompositionend at the previous cursor position
Can reproduce it in this embeds example

It can link to
官网嵌入式示例输入中文显示异常

Steps
To reproduce the behavior:

1. Click editable area, and make cursor focus
2. Focus input and input Chinese Pinyin
3. It will alse insert text in the previous cursor

Expectation
Only insert text in the input