If this is actually true (I don't see a citation), then it looks like a classic example of the "explaining away" effect (also know as "collider effect" or Berkson's Paradox): https://martin-thoma.com/explaining-away/
If this is actually true (I don't see a citation), then it looks like a classic example of the "explaining away" effect (also know as "collider effect" or Berkson's Paradox): https://martin-thoma.com/explaining-away/