Agree with Worth and FD. That swelling and the crack that's starting--that's could be from a SVB. I would split the stem further where it's already starting to split and hunt down the SVB. If you don't find one, as long as you've kept your cut parallel to the fibers on the stalk (vertical), you should be able to mound dirt and/or compost over the cut part and the plant will be OK. If you wait until a SVB causes the stem to burst, it's too late to save the plant.
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