Understanding Unhandled Fiber Error in Console

Why does this report

Unhandled fiber error

Unhandled fiber error

Unhandled fiber error

Unhandled fiber error in the console:

Runtime.runPromiseExit(runtime)

Runtime.runPromiseExit(runtime)

Runtime.runPromiseExit(runtime)

Runtime.runPromiseExit(runtime), but

Effect.exit,
Runtime.runPromise(runtime)

Effect.exit,
Runtime.runPromise(runtime)

Effect.exit,
Runtime.runPromise(runtime)

Effect.exit,
Runtime.runPromise(runtime)

does not

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