Trident Maple brown leaf tips

[mwkohler]

Is this a fungal or other issue?
Otherwise the tree appears healthy. Watering when top layer of substrate is dry.
Placed in mostly full sun with afternoon shade.

 

[hemmy]

I vote fungal.

Thread 'Bonsai Fungus'
https://www.bonsainut.com/threads/bonsai-fungus.28631/