https://www.canr.msu.edu/news/maple_leaf_blister_and_anthracnose_two_foliar_diseases_that_can_appear_on_s

There is no treatment, and the tree will recover. Just be sure to water the tree the equivalent of 1 inch of water per week while we are in drought conditions. This will help the tree push out new leaves from dormant buds and will reduce the stress on the tree from the lack of rainfall.

To properly water a tree, thoroughly soak the entire area under the branches of the tree. Apply one or two inches of water twice a week when no rain is expected. If you use a sprinkler, you can place a flat-bottomed baking dish in the area being watered and watch the level to determine when 1 to 2" of water has been applied.

More details on watering established trees is here: https://extension.umn.edu/planting-and-growing-guides/watering-established-trees-and-shrubs#when-to-water-trees-and-shrubs-1261760