I was trying to grow more spider plants from the little offshoots. On a whim, I dipped the cut ends in plain cinnamon from my spice rack (you know, the cheap stuff). It stopped them from getting mushy and they put out roots super fast. Now I have a whole new batch of plants starting (all from one parent plant). It's a neat trick if you're into making more plants for free.
Recall reading that cinnamon can stop fungus on plants. It keeps cuttings from rotting as they grow new roots. Your story proves this cheap trick is effective.
What kind of soil are you using for the cuttings? I've found they really need that super fast draining mix to not stay wet. The cinnamon helps a ton with rot, but if the soil holds water for too long it'll still get them. Try adding more perlite or just use plain old potting mix cut with a bunch of sand.