Years ago my dad and I bought a pair of ponies that were supposed to be broke. When we hooked them one of them got scared and bolted taking the other with her.
We later found out that pony had bolted previously so we sold her to a riding only home (she was fine under saddle) with full disclosure. She eventually ended up as field hunter taking care of kids where AFAIK she lived out her life.
The other pony was a great driving pony and didn’t give us any other problems.