ScottR
I had 2 wampee grafted onto citrus tree in February 2022. One died on its own and the other one broke off after I removed the electrical tape. Luckily I was able to take budwood from it and graft it onto a seedling.
I have another graft maybe about 4 years old that's grafted onto citrus. I've fruited from that graft once. The union does not look healthy. I'm currently airlayering it because I have a feeling it might die. I'll post a picture of it later. Just like lychee on longan, it's only temporary.