That all looks like fertilizer burn or root damage to me. Not disease. Strawberries do that too with fertilizer burn or root damage.
I’ve noticed certain roots corresponds with certain parts of the tree. Damage certain roots and it seems like you can damage certain parts of a tree.
Also i would not plant any tree less than 5 ft away from a fence or 15 ft away from a home
I think you’re right. Inspecting my plant over weeks, there is no clear sign of disease and definitely no pests. I did see that calcium deficiency could cause the burned tips look and deformation of new leaves. So, I thought to add foliar calcium, but at the same time I suspected poor nutrient uptake - so I checked soil pH, and it was way low. After researching and finding no suitable way to raise pH in an already-potted plant, I elected to repot in a more alkaline mix. The roots look good (at least as good as they ever did; persimmon trees have black roots LOL).
TL;DR increasing pH and adding foliar calcium. I’ll let you know the results.
Use a fertilizer with micronutrients. Your description is consistent with a shortage of one or more of the metals required by plants such as zinc.