The above screenshot was taken in an isolated instance with only the following:

• Minecraft 1.12.2
• Forge 14.23.5.2847
• Chisel-MC1.12.2-1.0.1.44
• CTM-MC1.12.2-1.0.1.30
• CreativeCore_v1.9.82_mc1.12.2
• LittleTiles_v1.5.0-pre188_mc1.12.2

(Top of each block type is a full block, while the bottom half slabs made with LittleTiles. On the right with 3x3 Chisel purple carpet blocks, left column is a mix of full blocks and LittleTiles half slab, while right column showing which block is a full block.)

I updated my modpack recently and found connected textures no longer work properly with LittleTiles. Here a comparison of my in game screenshot before and after the update.

I created an instance with only Chisel, CTM, LittleTiles and CreativeCore and managed to reproduce the same result, so I figured I'd report it.

Also, the broken texture seem to load differently on each game start (exit minecraft completely and restart the game).

(Most obvious on the big fan and the purple 3x3, but smaller 2x2 had some differences too.)

This is an issue of the Connected Textures Mod. I have reported it to them already, but they haven't replied yet (Chisel-Team/ConnectedTexturesMod#119). I recommend to use the version earlier 1.0.1.29 that one works fine.

Thanks for responding. Using 1.0.1.29 fixed the issue for my game. Hope they can find a solution for the newer updates