If one wild type copy of a homozygous lethal mutation can keep the animal alive wouldn't that count as a blend? At least with HG Woma we get to see that the pearl phenotype is different before it dies (with the one possible recent exception). Maybe a homozygous spider would look different if we got to see it?
As far as proof of a homozygous spider goes, I would say there is no proof that they live. The safest assumption might be that no new genotype can survive and breed until proven given that it might be impossible to prove if they don’t.
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