I've recently noticed that the flaxen gene isn't included in the gene test results. If I remember correctly, flaxen appears recessively (ff). I think I've even rerolled a chestnut before and had flaxen either appear or disappear from its coat. Is there a reason flaxen doesn't appear to be determined by gene presence in game like sooty, silver, and pangere are?

https://thehorse.com/153492/flaxen-color-genetic-research-in-progress/