You pays your money, you takes your chance. It's a lottery.
In my experience it's mostly down to the rough turning. If you turn from green wood, try and achieve even wall thickness all over, and you have a half decent chance of it not cracking. However, if a knot (branch) is significantly large , i.e. more than 30% of the main trunk, you still have a physical problem with the shrinkage, and you'd need to rough turn to very thin walls to allow the wood to warp instead of cracking. Which then means you have to finish the piece will green, because the warping will prevent any further turning once it's dry.
As I said, you pays your money, you takes your chance.