[OPEN] [GRO] Learn to ride a bike milestone doesn't unlock

Wanted to post a bit of an update on this as I had another child learn to ride a bike.  This time when the notification popped, they gained the milestone properly.  Three things were different with this child Sim:

• Only practiced riding bike on their own, did not "mix and match" solo learning with getting help
• Had two parents in the family tree (1st child was made as an infant in CAS while making the family, 2nd child was born in game.  I have never used a Science Baby so can't say anything on that.)
• Different world (I doubt this would change anything, but when trying to find a problem, too much information is better than not enough.  1st child was in world that came with the Horses ExPac, 2nd was in San Sequoia, the Growing Together ExPac.  Both were fully learned / practiced on home lots.)

There might be something that could be considered a fourth difference, but I think that it's more a "symptom" of the glitch than an actual difference.  This time there was no stuttering and the animation played with the child using both feet to push then pedal.