Search plugin did not load when setting onlyCover to true

[yequanrui]

Bug Report

Steps to reproduce

1. set onlyCover to true
2. enter from the cover to the home page
3. search plugin did not load
   
4. but search plugin will load when i reload the home page
   

What is current behaviour

The search plugin did not load

What is the expected behaviour

The search plugin should be loaded

Other relevant information

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

• Your OS: Windows11

• Node.js version: 16.14.0

• npm/yarn version: 6.14.16

• Browser version: Edge 101.0.1210.39

• Docsify version: 4.12.2

• Docsify plugins: search

Please create a reproducible sandbox

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