Trilogy’s tracker, it may depend on what constitutes “wet feet” for paw paw. They naturally thrive in flood planes. Also, once established, they do well with n full sun. Mine thrive well in a climate similar to yours but on top of a mountain on a sandy slope with high winds often. Maybe it’s not a burn on the leaf but a fungus or other disease. Either way, I wouldn’t worry much since paw paw is native and I’ve found need little to no care. Nice green leaves. Must get plenty nitrogen.