i have to make 3 slabs for mi mod so i 

	public static final RegistryObject<Block> DIRT_SLAB = registerBlock("dirt_slab",
			() -> new SlabBlock(Block.Properties.copy(Blocks.DIRT)));
	
	public static final RegistryObject<Block> GRASS_SLAB = registerBlock("grass_slab",
			() -> new SlabBlock(Block.Properties.copy(Blocks.GRASS)));

	public static final RegistryObject<Block> GRAVEL_SLAB = registerBlock("gravel_slab",
			() -> new SlabBlock(Block.Properties.copy(Blocks.GRAVEL)));	

internally the 3 slabs point to the same 3 parent_model_slab json 
basemmod:block/parent/slab/parent_slab_bottom.json
basemmod:block/parent/slab/parent_slab_double.json
basemmod:block/parent/slab/parent_slab_top.json

but the grass slab behave as she wants , the size is wrong and the size randomly change every time i put a newone  also the block dont have fisical boundaries i cannot step on it  

also happends when in slab double 

but the other the dirt one and the gravel one just behave normally as expected 

 

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how i fix this 

also is posible to make the grass slab match the bioma color in an easy way i cannot make it work before this dark green texture match the most of forest biomas but not all and gonna looks weird on custome biomas 



thanks for your time 




 

I'm pretty sure this version is not supported