I notice more with the upstairs if you pick up scanner right next to a number pillar it doesn't ping or mark it on the radar as correct. If none of the other 3 are pinging correct it's probably the one closest to where you picked it up.
I say probably but it's worked for me 100% of the time when there's no correct ping or radar mark
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You just have to back away from it, and it'll work as normal when you walk back into it.
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Omg it all makes sense
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Sarcasm?
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This happened to me and I had no clue, picked up scanner next to a pillar.
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As far as dungeon concerns go, it's unfortunately low on the totem pole, but it's rather consistent