Anchor not work with lazyload

[cncws]

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Issue Checklist

• I am using the latest version of NexT.
• I have reviewed guidelines for NexT, especially the Before Submitting An Issue part.
• I have reviewed the latest Roadmap on GitHub and searched for current issues, which does not help me.

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Expected behavior

When anchor link in sidebar is clicked, the scroll bar should go to that title.

Actual behavior

The scroll bar's action stoped before the right position due to the load of image(s). If all images are loaded, or set 'lazyload: false', the action will be right.

• Links to demo site with this issue: https://cwscn.github.io/notes/introduction-to-ml-with-python/neural-networks-deep-learning/
• Links to repository or source code of the blog: N/A

Steps to reproduce the behavior

1. N/A
2. N/A
3. N/A

Environment Information

Node.js and NPM Information

v12.12.0
6.13.7

Package dependencies Information

hexo-site@0.0.0 /Users/cws/Projects/Blog
├── babel-runtime@6.26.0
├── eslint@6.5.1
├── gulp@4.0.2
├── gulp-clean-css@4.2.0
├── gulp-htmlclean@2.7.22
├── gulp-htmlmin@5.0.1
├── gulp-imagemin@6.1.1
├── gulp-terser@1.2.0
├── hexo@3.9.0
├── hexo-deployer-git@1.0.0
├── hexo-generator-archive@0.1.5
├── hexo-generator-category@0.1.3
├── hexo-generator-index@1.0.0
├── hexo-generator-search@2.4.0
├── hexo-generator-tag@0.2.0
├── hexo-related-popular-posts@3.0.6
├── hexo-renderer-ejs@0.3.1
├── hexo-renderer-pandoc@0.3.0
├── hexo-renderer-stylus@0.3.3
├── hexo-server@0.3.3
├── hexo-tag-plantuml@1.0.0
└── webpack@4.41.6

Hexo Configuration

NexT Configuration

Other Information

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