No homepage loaded for the others lang with path /lang #1762

Bug Report

1. No homepage loaded for the others lang with path /lang
2. img in .md ,same format but one of them not working
3. When click lang switcher, it alway goto homepage, not the related doc with other lang

Steps to reproduce

https://docsify.js.org/#/zh-cn

https://mirr.one/#/zh-cn

scroll down

What is current behaviour

404

What is the expected behaviour

show the README.md as index

https://docsify.js.org/#/zh-cn/
https://mirr.one/#/zh-cn/

Other relevant information

1. src: https://github.com/initdc/mirr-docsify

2. with another problem of markdown img path
   website host on @netlify

check at here:

• path for en
• path for zh-CN

• Bug does still occur when all/other plugins are disabled?

• Your OS: macOS 10.13.6

• Node.js version: 16.14.0

• npm/yarn version: 12

• Browser version: Chrome

• Docsify version: @4

• Docsify plugins: search

Please create a reproducible sandbox

Mention the docsify version in which this bug was not present (if any)