I have this plant, I have been growing and propagating it for 15+ years. I agree with Gene and Lin. Let it sit unpotted and dry out and scar over. I might even treat those cut ends with fungicide. I know there are folks on the forum that do not like fungicide. But for me it is a useful thing. I use a powder called Captan. You can also use Cinnamon from the pantry. It has a natural antibacterial/antifungal property. When it looks like the rot has stopped and is scarred. repot it in a really well draining mix and don;t overwater it.
