Found the solution. Spruce leaves render strangely so that it shows an outline of the biome tint around them when far away. The reason my other spruce leaves looked fine was that it didn't use the "TintIndex=-1." I don't know if they are related, but I also used: "method=overlay_random" instead of fixed.
The leaves have this strange effect whith my custom leaf texture for spruce forest biomes:
.properties file:
The custom oak leaves for dark oak forests and the spruce leaves in snow biomes are fine.
.properties file:
Yekul10
Found the solution. Spruce leaves render strangely so that it shows an outline of the biome tint around them when far away. The reason my other spruce leaves looked fine was that it didn't use the "TintIndex=-1." I don't know if they are related, but I also used: "method=overlay_random" instead of fixed.
Yekul10