Check for task completion before sleeping #431
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As noted in the comment, if the timeout tasks only runs after the command was executed already, we'd run into a 5 second sleep before checking if the command completed already. This normally isn't a problem but takes up 5 seconds of a thread that can't do anything else in that time.
In the case of PaperMC/Paper#11171 there only was one thread available, making the problem obvious pretty fast.