Jest registerApolloClient is not a function

I've followed the recommendations from the README, but I get this error during tests:

```bash
TypeError: (0 , _experimentalnextjsappsupport.registerApolloClient) is not a function

9 |
10 |
> 11 | const { getClient: graphClient } = registerApolloClient(() => {
```
Apart from jest the code works fine.

Repo to reproduce:
https://github.com/levchenkod/next-apolo-jest-basic-setup

Use the linked reproduction repository and README guidance first, then inspect the Jest setup around the registerApolloClient call shown in the report. Reproduce the TypeError; done means the Jest run can use registerApolloClient successfully while the existing non-test Next.js behavior remains working.

Written by the indexing model from the issue text.