Resourcepack for Java 1.21.9+.
LINK👉 
1 Place half slabs into shelves to simulate vertical half slabs.
2 In Creative mode, use the Ctrl + Select(The default is the middle mouse button) shortcut to get shelves with half slab data, making it easier to place vertical half slabs.
3 This resourcepack is compatible with half slabs from other resourcepacks and mods. It's recommended to set this resource pack’s priority to the highest.
