• Every time i enter in my modded world i dont see any falling leaves, i tried to put the falling leaves mod in the resources pack archive, didnt change anything, might this help to resolve the problem, i have a texture pack (Multi pixel mod) plus other extras mod like Simple planes or Alex's Mobs

If you have Serene Seasons installed, the falling of leaves will depend on which season you're in. If you're in Spring, the default config setting is that no leaves fall. You can change that by editing the falling leaves config.