Ygorcs
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For what it can be worth, according to this study, https://www.cell.com/ajhg/fulltext/S0002-9297(17)30276-8, it is north Italians and Sardinians that share more ancestry in common with the Levant, "When we substituted present-day Near Easterners with a panel of 150 present-day populations available in the Human Origins dataset, we found that only Sardinians and Italian_North shared significantly more alleles with Sidon_BA compared with the Lebanese (Figure S8). Sardinians are known to have retained a large proportion of ancestry from Early European farmers (EEFs) and therefore the increased affinity to Sidon_BA could be related to a shared Neolithic ancestry.". It could be wrong, but imo it's worth entertaining, given that it is consistent with the idea that the Iran-neolithic gene flow dilutated the EEFs component and with it the Levant it carried.
I find this result really weird, considering that the Levant since the EBA at least was characterized by a high CHG and Iran_N input just like the you will find more in South Italy than in North Italy, whereas North Italians have more steppe ancestry than South Italians (though not by a very large margin at all). So, considering what we know about BA Levantines, and the results indicating that South Italians are related to ABA, which was certainly more related to Levant_BA than the more "Bell Beaker-like" people of North Italy is, I found that finding of that study really surreal, I honestly don't know how to explain it and doubt it's only because of shared EEF, particularly when EEF actually had very divergent WHG admixture.
I also don't think I'm getting Levant_N exclusively because of shared ancestry with ANF (EEF = ANF + WHG), because that would mean I'd get some Levant_N in virtually all samples from all parts of Europe, since almost all of them stillhave +35-60% of ANF nowadays. When the Natufian-like admixture is already built into Anatolia_N, it will only pick up Levant_N if it is somehow extra Levant-related ancestry for whatever reason. Or it might also, as you say, that when that Levant-related part of Anatolia_N is combined with some other component (I don't think Iran_N, it's far too divergent and not present in any appreciable frequency in Levant_N to heavily skew results and confuse the algorithms, but maybe something else)...