The moment a new map starts rendering, it renders the correct color for like a second and then it turns into vanilla colors.
Was in the maple_wood biome o plenty, pretty sure every biome has the same issue.
Edit: nvm just disable tinted blocks on Supplementaries tweaks. However it does make the visuals look quiet bad...

Try without any other mods on, just those two

Well that's different from what you just said. You just said that it does but just for a split second

Yep still exists, that tint feature on tweaks does not detect the correct color. Example maple woods [Biomes o plenty] red leaves tree

The colors that show up for a split second are the same one as when you turn off tinted blocked.
Simply tinted blocks do not detect the correct colors, thats a Supplementaries problem I guess.

I don't understand what you mean. Do different colours appear but just for a split second or do they appears but colorscarent what you expect? Whose are 2 very different issues so which is it