Can you share a photo of the planting site overall, so we can see what size the tree is and how much of the canopy is affected? (Is the sample in the photo just a removed branch? Or is the tree young and still in a pot?) The older growth might be malformed due to the overnight freeze back in late April, which affected the tender growth of many tree and shrub species. Since leaves cannot heal from damage, they remain deformed (or in some cases, too much tissue damage resulted in leaves drying out and falling off), but younger new growth emerges fine, as it appears to have in this case. If that continues to be the case here (new growth still looks normal), then the condition was likely a passing issue that isn't affecting long-term tree health.

Depending on how/where the tree is planted, acute exposure to an herbicide application might have been the cause (sub-lethal doses can cause leaf deformities, depending on the chemical involved). In that scenario, nothing can be done, but the normal-looking younger growth suggests the plant is already growing out of the damage.

Miri