Repository: create-react-app
Issue: Dynamic imports not working when acorn has resolutions
Labels: needs triage,issue: bug report

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### Describe the bug

Dynamic imports are not working with any version of `acorn` specified in `resolutions` field in `package.json`.

### Did you try recovering your dependencies?

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Yes, my yarn version is `1.22.5`.

### Which terms did you search for in User Guide?

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I think every possible one.

### Environment

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```
Environment Info:

  current version of create-react-app: 4.0.2
  running from /Users/ochdev/.npm/_npx/c67e74de0542c87c/node_modules/create-react-app

  System:
    OS: macOS 11.1
    CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
  Binaries:
    Node: 15.8.0 - ~/.nvm/versions/node/v15.8.0/bin/node
    Yarn: 1.22.5 - /usr/local/bin/yarn
    npm: 7.5.1 - ~/.nvm/versions/node/v15.8.0/bin/npm
  Browsers:
    Chrome: 88.0.4324.146
    Edge: Not Found
    Firefox: 84.0
    Safari: 14.0.2
  npmPackages:
    react: ^17.0.1 => 17.0.1
    react-dom: ^17.0.1 => 17.0.1
    react-scripts: 4.0.2 => 4.0.2
  npmGlobalPackages:
    create-react-app: Not Found
```

### Steps to reproduce

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(Write your steps here:)

1. Create new project with `create-react-app`
2. Add any version of `acorn` to `resolutions` field in `package.json`
3. Install deps `yarn` or `npm i`
4. Add any dynamic import to the project
5. Start project `yarn start` or `npm run start`
6. Go to `localhost:3000` and see crashed app

### Expected behavior

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Dynamic imports should work as expected.

### Actual behavior

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<img width="707" alt="Screenshot 2021-02-08 at 09 16 31" src="https://user-images.githubusercontent.com/24656679/107193147-ce58ef80-69ee-11eb-8932-f643adb3fc8b.png">

### Reproducible demo

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https://github.com/ochmanski/cra-dynamic-import-acorn-res

Instructions are the same as cloning every new CRA project.
```
$ git clone git@github.com:ochmanski/cra-dynamic-import-acorn-res.git
$ yarn
$ yarn start
```

```
$ git clone git@github.com:ochmanski/cra-dynamic-import-acorn-res.git
$ npm i
$ npm run start
```

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