What is the rating that shows up between the event ratings and bravery in the Breeding History?

If foals are rating it shows their ratings like S/S/A for example, but it has None beside it(S/S/A/None). I thought it was bravery at first but no because if you look at the Breeding History of a horse with foals who have their bravery tested it shows that like S/S/A/None/A.

What does the None indicate?

The fourth rating is for Bravery. If it says none, the horse is not bravery rated.

Sorry but that is not correct. The bravery rating shows up after the fourth None in the Breeding History. Foals who have had their bravery rated show the bravery rating after the none like S/S/A/None/A or S/S/A/None/Sub. It cannot be bravery.

Maybe put a link to a horse that is showing this rating

It shows on all mares, for any rated foal it will have a None after the rated, but even for mares who have had foals ridden in Explore it still shows a None with their bravery rating after the None.

This is one of my mares. If you look in her Breeding History she has three foals. One is completely unrated. One is deceased but it shows their rating still S/S/A/None/A. The other I have its showing as S/S/S/None/Sub. That last Sub is her bravery rating, that foal has Subpar bravery. That means the None before the Sub isn't bravery. So I'm confused as to what it is, I even looked through some of the leaderboard mares to try to see if they had foals which didn't carrying a fourth rating None, I didn't see any that had another rating but I didn't look through every mare.

Image to show what I mean

The none is a placeholder rating for bravery that got introduced to solve this bug.

Thank you so much! I was so confused and thought I was missing a part of the game. Now that I know it's just a placeholder I can ignore it thanks again!