Technically speaking, there are no false negatives. It's right in the rules that a sixth sense can mean either an item or a monster. That's why my instinct is to distrust any sixth sense we come across outside of niches: I trust the game's capacity to mess us up over its capacity to help us.
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Still, we have to be careful from now on...
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I hope we can make it through the last round.
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[That's the worst part, really: We fell for a trap.]
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We have a sixth sense and sound ping. I'm marking everything.
[We can't really afford not to at this point.]
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(I might actually die if we run into another monster like that one.)