fertility of papaya-pubescens-serena?

[Giannhs]

Hi! Has anyone grown this type of papaya: https://www.andrewsgarden.be/en/exotic-tropical-fruit-trees/papaya-pubescens-serena/a-190-16 I have bought 4 seedlings of it, and only one is alive and growing. One was received broken; the other two withered and dried up for no known reason. I have given them plenty of water, in a big container each, which is cut around the bottom for draining. I might be satisfied with only one, but will one of this variety produce fruit? What are the chances?