Wouldn't the 120 IQ subpopulation also have some people whose IQs are "genetically" more like 130 but they've gotten unlucky with environmental factors, pushing

Wouldn't the 120 IQ subpopulation also have some people whose IQs are "genetically" more like 130 but they've gotten unlucky with environmental factors, pushing the genetic average a bit towards 120? It would be smaller than the number of 110 people who got lucky, but non-zero. Is this baked in to h^2?