Have you cleared the mission to obtain Whisper and unlocked its pattern? the oracles grant the white nail intrinsic upgrades so they may be hidden due to that
If you have Whisper pattern already unlocked then is it all of them or just specific ones? people have had issues with some like Oracle 7
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Yep, that's right, I first had to do the quest on my second account to get the whispers, just then the oracles spawned