Sometimes you turn on the Autumn Overlay and your trees are still green, or only some foliage changes color. The cause is almost always pack order or a stale reload.
Quick checks
1. Is the overlay actually selected? Open Options > Resource Packs and confirm the overlay is in the Selected column, not Available.
2. Is it above your other packs? Packs higher in the Selected list override the ones below. If your main texture pack sits above the overlay, its own foliage colors cover the autumn ones. Move the overlay to the top.
3. Is another pack fighting it? Some packs also recolor leaves or grass. If you run several, try moving them one at a time below the overlay. You can also temporarily disable them to find the one that conflicts.
Forcing a refresh
- After changing pack order, click Done and let the reload finish completely.
- If colors still look wrong in-world, press F3 + T to reload resource packs without leaving the game.
- If that does not help, leave the world and rejoin so the chunks around you redraw.
What should and should not change
The overlay recolors leaves, grass and plants. It is meant to leave the shapes and designs of your active packs untouched. If stone, logs or other blocks look different, another pack in your list is causing it, not the overlay. Once the order is right, forests should show warm reds, oranges and yellows while your main pack's style stays intact.