Understanding `Fiber terminated with unhandled error` Messages in Effect Typescript

Hi. Can someone help me understand the Fiber terminated with unhandled error messages emitted on the debug logger?

1. Is there something about this in the documentation? I couldn't find anything.
2. What does it mean? Does it always signal a problem, or is it just like with onPossiblyUnhandledRejection, where the Promise rejection may eventually still get handled?
3. How do I track down what's causing it?
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