In the image, you'll see a top-down view of all stripped logs, and warped and crimson stems. You'll notice that the stripped logs all have a darker ring around the edge of the block, but the stripped variants of the warped and crimson stems don't have this ring, even though the normal warped and crimson stems do.

It seems this is because the side colors of the stripped stems are the same as the colors of the top of the stripped stems, though all of the other stripped logs have a difference in side and top color.

Relates to MC-171448