Can you tell us which fungicide do you use?Here is a trident of mine, which has a similar issue as yours. Otherwise healthy mature tree. Every spring, I see some clusters of leaves with curled edges, some black, etc. I think fungus on leaf tips where water may remain on leaf. I cut them out, watch. Will spray with fungicide if more appears.
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Not sure yet, I am pulling out all the stops this year. I repotted it in a better draining substrate without akadama and treated it with lime sulfur last month. Now it has leafed out and looks great. Next I plan to hit it again with Infuse proactively and also some Daconil and copper in alternate months.Did this resolve the infection?