Grafting is not creating new plants?

Whenever I splice a shoot onto a plant that together should create a new plant, it appears to work, but when I try to harvest it, (with my sim who is lvl 10 in gardening) I only get the two plants that I grafted together and not the new plant. This happened with lillies and snapdragons, and apples and cherries. I didn't try it with any other plants. I tried to find this issue but nobody else seemed to have it, and I noticed a common fix for grafting issues was making sure everything was on your lot. All these plant are on my lot, and the shoots are from plants on my lot too. I have never grafted plants in the Sims 4 before and I wasn't sure if this is a bug or if I am just doing something wrong.