Could not find/install babel plugin 'proposal-decorators'

🐛 bug report

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project
  adheres to.
• I have searched the issue tracker for an issue that matches the one I want
  to file, without success.
  • https://github.com/codesandbox/codesandbox-client/issues/7550 looks related

Description of the problem

Example with an SVG import is resulting in an error:

Error
Could not find/install babel plugin 'proposal-decorators': Cannot find plugin 'proposal-decorators' or 'babel-plugin-proposal-decorators'

This is happening when deploying with react-codesandboxer.

Removing the SVG imports resolves the issue, as does fiddling with dependencies.

After deploying, manually adding @babel/plugin-proposal-decorators as a dependency resolves the issue. Deploying with @babel/plugin-proposal-decorators as a dependency does not, but then removing it seems to.

How has this issue affected you? What are you trying to accomplish?

The example I have deployed is unusable.

To Reproduce

I struggled to create a minimal reproduction, but I will share the sandboxes I am seeing the issue in.

Link to sandbox:

• Example deployed without @babel/plugin-proposal-decorators
  • Adding @babel/plugin-proposal-decorators seems to fix the issue
• Example deployed with @babel/plugin-proposal-decorators
  • Removing @babel/plugin-proposal-decorators seems to fix the issue

Your Environment

Start with the two linked sandboxes and the react-codesandboxer deployment path, comparing the cases with and without @babel/plugin-proposal-decorators. Investigate how SVG imports trigger installation of the proposal-decorators plugin. Done means deployments no longer fail with the missing-plugin error without manual dependency changes.