[pull] main from facebook:main#209
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<!-- Thanks for submitting a pull request! We appreciate you spending the time to work on these changes. Please provide enough information so that others can review your pull request. The three fields below are mandatory. Before submitting a pull request, please make sure the following is done: 1. Fork [the repository](https://github.com/facebook/react) and create your branch from `main`. 2. Run `yarn` in the repository root. 3. If you've fixed a bug or added code that should be tested, add tests! 4. Ensure the test suite passes (`yarn test`). Tip: `yarn test --watch TestName` is helpful in development. 5. Run `yarn test --prod` to test in the production environment. It supports the same options as `yarn test`. 6. If you need a debugger, run `yarn test --debug --watch TestName`, open `chrome://inspect`, and press "Inspect". 7. Format your code with [prettier](https://github.com/prettier/prettier) (`yarn prettier`). 8. Make sure your code lints (`yarn lint`). Tip: `yarn linc` to only check changed files. 9. Run the [Flow](https://flowtype.org/) type checks (`yarn flow`). 10. If you haven't already, complete the CLA. Learn more about contributing: https://reactjs.org/docs/how-to-contribute.html --> ## Summary Fixes `await`-ing and returning temporary references in `async` functions. These two operations invoke `.then()` under the hood if it is available, which currently results in an "Cannot access then on the server. You cannot dot into a temporary client reference..." error. This can easily be reproduced by returning a temporary reference from a server function. Fixes #33534 ## How did you test this change? I added a test in a new test file. I wasn't sure where else to put it. <img width="771" height="138" alt="image" src="https://github.com/user-attachments/assets/09ffe6eb-271a-4842-a9fe-c68e17b3fb41" /> <!-- Demonstrate the code is solid. Example: The exact commands you ran and their output, screenshots / videos if the pull request changes the user interface. How exactly did you verify that your PR solves the issue you wanted to solve? If you leave this empty, your PR will very likely be closed. -->
Fixes #33534. `.then` method can be tested when you await a value that's not a Promise. For regular Client References we have a way to mark those as "async" and yield a reference to the unwrapped value in case it's a Promise on the Client. However, the realization is that we never serialize Promises as opaque when passed from the client to the server. If a Promise is passed, then it would've been deserialized as a Promise (while still registered as a temporary reference) and not one of these Proxy objects. Technically it could be a non-function value on the client which would be wrong but you're not supposed to dot into it in the first place. So we can just assume it's `undefined`.
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