Coverage summary shows all Unknown%

[csymeonides-mf]

=============================== Coverage summary ===============================
Statements   : Unknown% ( 0/0 )
Branches     : Unknown% ( 0/0 )
Functions    : Unknown% ( 0/0 )
Lines        : Unknown% ( 0/0 )
================================================================================

Seems similar to #61 but the fix is not working for me.

Logs and screenshots
Full debug logs

Versions

• What is this plugin's version? Latest (3.8.1) (unfortunately I can't say exactly when this started happening)
• What is Cypress version? 5.0.0
• What is your operating system/shell/Node/NPM? This is running in docker with base image cypress/browsers:node12.18.0-chrome83-ff77
• How do you instrument your application? I use babel-plugin-istanbul. Here is my config-overrides.js I have:

const { addBabelPlugin, addBabelPreset, override, addLessLoader } = require('customize-cra');
const rewireReactHotLoader = require('react-app-rewire-hot-loader-for-customize-cra');

module.exports = override(
    addLessLoader(
        { lessOptions: { javascriptEnabled: true }}
    ),
    rewireReactHotLoader(),
    addBabelPlugin('istanbul'),
    addBabelPreset('@babel/preset-react'),
);

• When running tests, if you open the web application in regular browser, and open DevTools, do you see window.__coverage__ object? Can you paste a screenshot?
  
• Is there .nyc_output folder? Is there .nyc_output/out.json file. Is it empty? Can you paste at least part of it so we can see the keys and file paths?

{
  "/app/src/runtimeConfig.ts": {
    "path": "/app/src/runtimeConfig.ts",
    "statementMap": {
      "0": {
        "start": {
          "line": 1,
          "column": 23
        },
        "end": {
          "line": 1,
          "column": 61
        }
      },
      "1": {
        "start": {
          "line": 4,
          "column": 15
        },
        "end": {
          "line": 4,
          "column": 51
        }
      },

• Do you have any custom NYC settings in package.json (nyc object) or in other NYC config files As recommended in Does not work with Create React App #61

    "nyc": {
        "extends": "@istanbuljs/nyc-config-typescript",
        "all": true
    }

• Do you run Cypress tests in a Docker container? Yes, as mentioned above

Describe the bug
All entries in the console output of npx nyc report --reporter=text-summary are "Unknown%". The actual report looks fine, but the invalid value in the console output breaks my coverage badge in gitlab.

Link to the repo
No open source repo I'm afraid, but happy to provide additional code snippets if necessary.

[csymeonides-mf]

Solved! I just needed to copy my frontend src directory into the same parent directory as cypress