All of the ones I've rooted have been subjected to the same variables as others of the same variety, somehow a couple end up with rot that hollows the cutting out from the middle, or leaves the stick so flimsy I could tie it into a knot. I can't explain it.
Maybe using the baggie method, the one disadvantage is you may unknowingly end up with mold at a 'more open' site like leaf scar. You may not see it, but it's really there.... fortunately, I have spares of each one. I am still happy with rooting sucess, if my only loss is 5 in 150, this is sufficient for me, especially when some of those 150 were cut into multiple cuttings, and all of those managed to survive also! By some people's standards, I could still be at a rooting percentage about 100% ;)