A very very very small amount of pets (about a dozen), were affected by this.

It actually was a bug fix. These pets actually had these genes visible, but due to an error, the Site thought they had nothing visible or carried.

The bug was discovered by offspring showing up with genes that neither parent seemed to show or carry.

Thus, I have fixed the issue so that these genes/mutations now display properly as well as fixing the bug causing the issue in the first place.

So if you own one of the few pets affected by this, enjoy the free gene/mutation