Instead of using Dark Oak wood like their original variants, dynamic Red Autumn trees use regular Oak wood, wich is inconsistent with the original design.

Here's a comparison between them:

I'm guessing this was disparity between 1.12 and 1.16 I missed out on, I'll fix it now.

Also your leaves appear to have the wrong render type set...?

Ah yes, I remember hearing about smart leaves before actually.

Optifine. it has a option for "Smart" leaves, wich makes them look like this. it's purely for perfomance and better aesthetics, as the leaves look horrible with "Fast" graphics

I'm not going to make this change yet since it makes existing red autumnal oaks turn into a normal oak tree in existing worlds. I'll think of a workaround ASAP but until then I'm going to leave it how it is.

I'll also make a tree pack as a temporary workaround.

Temporary workaround: Autumnal Oak Fix

so it will remain open untill it get a actual fix, correct?

Yeah, I'll leave this open until then.

also, I indeed didn't knew that they used to be made of regular oak logs, I thought it was always in this way