I have never heard of this with cinnamon and HGWG.

It doesn't make sense to me that it would be the morph combination because those two morphs in particular really only have problems when paired with genes of the same ALS group. Animals carrying a gene from the 8ball ALS are usually only prone to deformity when they're homozygous or paired with another gene from the same ALS. Same with HGWG, as (theoretically) part of a spider-champagne-woma ALS group. They generally only have major defects if paired with other genes in the same complex.

Cinnamon womas, black pastel champagnes, black bees, etc. are all commonly seen, bred and hatched. I feel like these kinds of deformities would be seen with higher frequency if it were actually the ALS groups interacting. I would be more inclined to think it was the actual pairing and that the individual animals are best not put together.