A lot of the blocks
You can now make those cursed looking misaligned stairs with sandstone.
All the connected textures on slabs.
Textures on upper slabs do not connect to the ones of the bottom slabs, (from the same Y level).
These only apply on the big trees.
Stone bricks now have borders and the variants connect with each other (horizontally).
This version has the transitions faded. A folder with this version can be found on PMC: https://www.planetminecraft.com/texture-pack/connectibles/
After a struggle for CTM with Optifine with rotational blocks, I finally managed to make them completely work in game!
Copper variants now have transition between them.