Yes,
Correct.
Nick Mutton discusses the issue during a podcast and there are other well known Morelia breeders that cover the topic.
I don't have the time to dig for the links but it is a known issue.
Some breeders even question the ethics of working with the gene.
"Correct" is the answer to the question.
Just curious,
You mentioned you were only interested in breeding and producing wild type animals.
Why the sudden obsession with a morph gene producing known issues?