Regression test: Stylesheet suspends indefinitely when part of error boundary UI during initial hydration #27258
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Adds a failing test for a case discovered by Next.js. An error boundary is triggered during initial hydration, and the error fallback includes a stylesheet. If the stylesheet has not yet been loaded, the commit suspends, but never resolves even after the stylesheet finishes loading.
Triggering this bug depends on several very specific code paths being triggered simultaneously. There are a few ways we could fix the bug; I'll submit as one or more separate PRs to show that each one is sufficient.