There's 2 item models for the old wooden slab:
old_wood_slabwood_old_slab
Simple fix:
Remove the unused models.
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Comments 5
old_wood_slab was removed, wood_old_slab is still there.
Actually both models were unused because the method net.minecraft.client.renderer.block.model.ModelBakery.registerVariantNames() did not register the old_wood_slab type.
wood_old_slabis the unused one.