react start cannot find files in public folder - node.js

Question

When running npm start, my code shows a blank page, without favicon either, and the browse console shows
Loading failed for the <script> with source “http://localhost:3000/short_text_understanding/static/js/bundle.js”. bundle.js:23:1
Loading failed for the <script> with source “http://localhost:3000/short_text_understanding/static/js/0.chunk.js”. bundle.js:23:1
Loading failed for the <script> with source “http://localhost:3000/short_text_understanding/static/js/main.chunk.js”. bundle.js:23:1
If it helps debugging, my code works previously, but after npm audit, my package.json changed
- "react-scripts": "3.4.1"
+ "react-scripts": "^3.4.3"
My package.json
{
"name": "short_text_understand",
"version": "0.1.0",
"private": true,
"dependencies": {
"#testing-library/jest-dom": "^4.2.4",
"#testing-library/react": "^9.5.0",
"#testing-library/user-event": "^7.2.1",
"react": "^16.13.1",
"react-dom": "^16.13.1",
"react-scripts": "^3.4.3"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"test:debug": "react-scripts --inspect-brk test --runInBand --no-cache",
"eject": "react-scripts eject",
"lint": "eslint .",
"predeploy": "npm run build",
"deploy": "gh-pages -d build"
},
"eslintConfig": {
"extends": "react-app"
},
"proxy": "http://localhost:5000",
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
},
"devDependencies": {
"eslint-config-airbnb": "^18.2.0",
"eslint-config-prettier": "^6.11.0",
"eslint-plugin-jsx-a11y": "^6.3.1",
"eslint-plugin-prettier": "^3.1.4",
"gh-pages": "^3.1.0",
"prettier": "^2.0.5"
}
}
Structure of source is
.
├── Dockerfile
├── LICENSE
├── README.md
├── docker-compose.yml
├── nginx
│   ├── Dockerfile
│   └── nginx.conf
├── package-lock.json
├── package.json
├── public
│   ├── android-chrome-192x192.png
│   ├── android-chrome-512x512.png
│   ├── apple-touch-icon.png
│   ├── favicon-16x16.png
│   ├── favicon-32x32.png
│   ├── favicon.ico
│   ├── index.html
│   ├── manifest.json
│   ├── robots.txt
│   └── site.webmanifest
├── src
│   ├── index.js
│   ├── normalize.css
│   ├── skeleton.css
│   └── style.css
└── src_python
├── Dockerfile
├── __pycache__
What I do not understand is why the bundle.js disappears, and why my favicon is not loaded, even though I did not move the public folder, and things worked before.
I am totally new in this, please tell if you need any other information

Answer 1

If you are using create react app to generate application then follow the instructions given in this link
https://create-react-app.dev/docs/using-the-public-folder/

Answer 2

The reason was because I used ublock (not ublock origin). Note that this is not the of the shelf version, as I selected all the black list