Hmmm, I have not been in that position, but I can see how a buyer who convinced the breeder that they were 'basenji people' and got a pup, then perhaps didn't follow all the advice, got busy with their life, maybe some unplanned changes, and a year later that sweet pup is a mess, biting or destructive. It might feel very humiliating to go back, head bowed, and 'admit' that maybe you weren't the 'perfect owner' for their darling pup.
So you join a forum and start asking for advice, maybe someone will have a magic solution for you. You just don't want to face your breeder as "a failure" with a wild pup.
Make sense? What could breeders do? Toss that scenario out there at the time of purchase, and say it's OK, not ideal, but OK, it happens. Pave the way for teaching and forgiveness, and really let the buyer know that you are there for them, willing to take the dog back anytime if necessary, no questions asked.