composing lost when select multi lines

[4-1-1]

A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the behavior:

1. select multi lines
2. Use a chinese input method, and input some word, the composing position is not right, and if input space to done composing, and a spare space show out

Version 11.19.2

Screenshots

Desktop (please complete the following information):

• OS: mac montery
• Browser chrome
• Version 95