Curious if that's really the only thing that was fixed...
That same mission will:
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spawn the same amount of shriekers regardless of difficulty
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Fail to complete for the operation even if you succeed
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Score only 1 star even if both objectives are completed
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Not allow you to complete one of the objectives unless you:
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precisely call down the dark matter in the middle
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Carry that exact dark matter to one of the drills
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Input the same dark matter without dropping
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And, If you drop the dark matter at all, or do not call it down in the middle, it won't count as complete at the end mission screen.