My dragon fruit cactus (Hylocereus) got a crack in the main stem while I was repotting it (it's very top-heavy). The crack is not all the way through the stem and I was able to seal it using the weight of the plant. How should I care for the plant? Will the crack heal? Or will it start to die?
I would go ahead and prune the plant to eliminate the break.
You can actually go ahead and propagate the cuttings from the plant.
Here is an article with more information.