[2.2.8] Texture Patches won't apply for certain textures if used on the floor/ceiling.
I first noticed this in a map that I was making and I thought I might've applied the wrong texture or something. Turns out... some textures like ACWOODS1 & ACWOODS2 have some patch textures applied... but only if the textures are used on walls, they won't get applied on the texture if it's on the floor/ceiling. If you look closely... you'll see that the textures on the floor/ceiling are missing some colors compared to the wall texture.
Test map that I used for the above screenshots.