Description of the Bug
Frame drops in the Hemlock forest, in addition they don't seem to be having their transparency set correctly.

To Reproduce

1. Use the common performance boosting mods and Immersive Weathering
2. Enable Alt+F3
3. Go to a hemlock forest.
4. Notice the frame drops.

Expected behavior
Frame drops shouldn't be happening.

Screenshots & Video

Logs & Environment
https://pastebin.com/TbH6YMuL

• Full log: Too Large, error prints for every individual leaf block.

Also happens with redwood leaves:

Pausing the game seems to remove the FPS lag, there doesn't seem to be any tick-lag. The lag only happens when up close to the leaves, from far away the frame rate is stable:

ok so just tested, it happens with the original fabric version as well, however I don't think this is an issue on terrestria fabric side either, I think this is entirely an immersive weathering issue

ok turns out there were already issue reported: TerraformersMC#279
AstralOrdana/Immersive-Weathering#174

It might be, though no other biome adding mod has this issue, not even Traverse or Cinderscapes. I'm guessing it's related to the "falling leaves" effect not working right with the leaf blocks here, and something is causing them to be solid blocks instead of transparent.

Yah i already know the cause, immersive weathering logs every tick if the leaf found is not an instance of LeafBlock, which terrestria's are not, which causes the lag. Quite stupid piece of code imo, not even sure why that check is needed