Today i decided to update my private modpack to 1.16.4 since most mods had a working build for that version, i createad a new world to do some troubleshooting and verify if everything was working as intended, but i noticed that the biomes were a little to "plane" and realised that most of the forests from BYG aren't generating with trees.
I unistalled all the mods that affected world generation, leaving only optfine, byg and minimap that shows my current biome.

And when i created a new wolrd i spawned on a Seasonal Forest biome and imeadtly noticed the lack of trees and folliages:

I looked for posts related to this issue but i couldnt find any, is this a known bug ?

Remove optifine(all world gen mods are ruined by optifine fyi). Duplicate of #97