You put the horse on the ground, determine what food to feed it, and the chance comes where it is NOT supposed to!
In the normal version, you have a chance of pumping +14% for 1 Characteristic, +7%/+7% for 2 Characteristics or +7%/+3%/+3% for 3 Characteristics. This has been the case for a very long time.
Compare with broken options.
And in the broken version, you cannot increase the +% Grit chance in any way. We have 10 types of food and only 4 characteristics. A broken horse cannot increase chanse to Grit-up! I claim that this is 100% a bug!