[Bug]: Repl fails with `.method must be a string (While processing: "base$1")`

### 💻

- [ ] Would you like to work on a fix?

### How are you using Babel?

Other (Next.js, Gatsby, vue-cli, ...)

### Input code

https://babeljs.io/repl/#?browsers=ie%2011&build=&builtIns=false&corejs=3.6&spec=false&loose=false&code_lz=LYQwlgdgFAlA3AKAGYCZaIDYFMAuACMPAXjwAZEQBnATwgGM8kBXenMAewj1EljwG8EePHU6V22AHQZ2AcygAiABZgF8IXhAB3cPm268EJhgyJhoiOKkz5YdQF8ECKrQbNWHLqj6Dh-sPhGJmaaOgGGxqYaYADUMYiOQA&debug=false&forceAllTransforms=false&shippedProposals=false&circleciRepo=&evaluate=false&fileSize=false&timeTravel=false&sourceType=module&lineWrap=true&presets=env%2Creact%2Cstage-2&prettier=false&targets=&version=7.16.3&externalPlugins=%40babel%2Fplugin-transform-regenerator%407.16.0%2Cbabel-plugin-polyfill-regenerator%400.2.3&assumptions=%7B%7D

I added "babel-plugin-polyfill-regenerator" and now it says `[BABEL] /repl.jsx: .method must be a string (While processing: "base$1")`

### Configuration file name

_No response_

### Configuration

REPL issue

### Current and expected behavior

Current behavior: `[BABEL] /repl.jsx: .method must be a string (While processing: "base$1")`

Expected behavior: Either a readable error message indicating what I did wrong, if I did something wrong, or some output code.

### Environment

Not applicable

### Possible solution

_No response_

### Additional context

_No response_

Open the linked Babel REPL reproduction and rerun it with the listed presets and external plugins, especially babel-plugin-polyfill-regenerator. Trace where the `.method must be a string` error is produced and verify the REPL either reports a readable configuration error or generates output code.

Written by the indexing model from the issue text.