I saw that same thing on a youtube video. Amazing, so very interesting. Hope you get some input on what to do.

Cal -

it happens often when the mother leaf had some laceration on the top or a crack. What you can do - you wait until your piggy-back plantlets are good size - 3-4 leaves over a dime size. Then you can accurately cut them off mama- leaf - and root under the baggie in a soil. They root immediately. Or you can cover the mother leaf with the baggie - and put some humid sphagnum moss around the plantlet - it will also develop roots - and you can move the piggy into the soil - roots and sphagnum.

i.