Bug report: Single fetch: Throwing a response stub with a 3xx status from a resource route results in an unexpected server error

[haines]

We had a couple of routes that were only there to redirect to another page in the application, and I forgot to put a default export in the modules.

We discovered that for these routes, the redirect works for data requests, but not for document requests.

I'm guessing this may just be the same problem as in #9471, but it manifests differently (presumably because without a default export it's not treated as a UI route). Instead of a turbo-stream error, the response stub propagates all the way to returnLastResortErrorResponse and we get the plaintext 500 Unexpected Server Error page.

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[brophdawg11]

Thank you for the bug report! This is handled by #9488

[brophdawg11]

And also has some additional test cases added in #9501