Why is paimon not affected by ley lines?

Maybe I'm being dumb and forgot a lore drop or missed a world quest. But I'm catching up now schneznaya is out. In song of welkin moon act ix (not sure how far in, a little after arriving at caravan ribat) the traveler goes further than everyone else to investigate the weird ley line blossoms, with it being pointed out that she can do so because she's not written in irminsal. But paimon goes with her. When did we find out paimon wasn't connected to the ley lines either?