The big trees planted in August and the branches sawn have sprouted. The sawn branches have not sprouted yet. What happened?

This is normal. Plants will adjust themselves. If they lack branches and leaves, they will soon grow some branches and leaves. When there are too many branches and leaves, when the water supply is insufficient, they will abandon some branches and leaves, which are generally old below and let them wither. If you don't have sawn trees, it's good that the roots can provide water for the existing branches and leaves. If you recover for a while, it will sprout. But if the recovery is slow, it may sprout next spring.