Emerging pawpaw leaves bright yellow

[Triloba Tracker]

This one of my grafted trees leafing out. Hard to tell from the pic but the baby leaves emerging are highlighter-yellow.
It’s been in the ground a full year.
Only tree that’s doing this. Have not fertilized, so it’s not burn. This and all trees just starting to push leaves.
Only thing that has happened was a freeze 3-4 nights ago. But in my experience that results in darkened, eventually black leaves.
Young pawpaw leaves can be yellowish until mature but nothing like this ....