In my opinion burned leaf edges in spring and summer almost always means dehydration. It doesn't take much to burn maple leaves though tridents are a little more robust than JM. Even a few hours dry will cause burn like that and it is not always easy getting watering spot on as a beginner. Transplant after the leaves are open can also cause enough stress on a tree to cause a few burnt leaves, even with minimal root reduction. I have occasionally had every leaf on tridents turn brown after late repots with significant root reduction. Good news is these are resilient trees and they soon grow new leaves and keep on growing.
I can't judge
@Tonsai weather or climate as no location given yet but a hot day, especially with wind can cause burnt leaves. Most areas require a little extra protection through summer to prevent burnt leaves on maples.
Over watering takes many weeks to affect the roots and it usually needs to be significant overwatering or a combination of poor draining soil and too much water or pots sitting in saucers that hold water for long periods for root rot to affect tridents.
A few burnt leaves will not affect overall tree health (thank goodness because most of mine have a few or sometimes more affected leaves through summer). The tree seems to have plenty of healthy leaves so affected leaves can be removed to improve appearances.