As said in the title, the top texture of the hay block uses a slightly more saturated palette than the side, which it shouldn't. You can see it on the first image in the attachments how this can look a bit weird in game.

I have also made a comparison of the textures which can be found on the second image in the attachments. The top row are the current Minecraft textures - top and the side of the bale, and in bottom right, you can see the fix where I used the colour palette from the side and applied it to the top.

I hope this gets fixed soon, have a nice day!