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Scala Native WeakConcurrentBag NPE when forking 10K fibers #9681

@hearnadam

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@hearnadam
[info]   - PromiseSpec - waiter stack safety
[info]     Exception in thread "zio-fiber-931" java.lang.NullPointerException: null
[info]     	at scala.scalanative.runtime.package$.throwNullPointer(Unknown Source)
[info]     	at <none>.(Unknown Source)
[info]     	at java.util.concurrent.ConcurrentHashMap.treeifyBin(Unknown Source)
[info]     	at java.util.concurrent.ConcurrentHashMap.putVal(Unknown Source)
[info]     	at java.util.concurrent.ConcurrentHashMap$KeySetView.add(Unknown Source)
[info]     	at zio.internal.WeakConcurrentBag.addToLongTermStorage(Unknown Source)
[info]     	at zio.internal.WeakConcurrentBag.add(Unknown Source)
[info]     	at zio.internal.FiberScope$global$.add(Unknown Source)
[info]     	at zio.ZIO$unsafe$.makeChildFiber(Unknown Source)
[info]     	at zio.ZIO$unsafe$.fork(Unknown Source)
[info]     	at zio.ZIO.$anonfun$forkWithScopeOverride$2(Unknown Source)
[info]     	at zio.ZIO$$Lambda$280.apply(Unknown Source)
[info]     	at zio.PromiseSpec.spec(PromiseSpec.scala:127)
[info]     	at zio.PromiseSpec.spec(PromiseSpec.scala:124)

I introduced a new test in #9569 which resulted in this strange failure on Native.

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