This is what I have read on here about Cream Legbars because they have recently gotten very popular. I had one but lost her to a predator when she was still a pullet so don't know from experience. It makes sense to me though because I have seen some trendy breeds being sold online that don't look up to standard which makes me think people are breeding indiscriminately especially since the pandemic.
It might have been the Ayam Cemanis that I was reading about having a lot of fertility issues.