We are seeing a few instances where we are getting stuck on the allOf(...).join(). Best guess is that async semaphore isn't completing properly for this case. This adds exception handling within each future, setting a reference to the throwable that will then be thrown back up, causing singularity to abort (as it would normally do for uncaught exceptions in scoring). This isn't a fix for the underlying bug yet, but I'm hoping this can tease out the root cause of the exception, since we are currently swallowing these exceptions
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