Tuff blocks variants aren't grouped together to their block variants respectively

The tuff block variants aren't grouped together to their block variants respectively. So, for example, the stairs, slabs, and walls variants aren't grouped together with the other stairs, slabs, and walls variant respectively in the creative tab.

Also, Chiseled Tuff, Tuff Bricks, and Chiseled Tuff Bricks aren't grouped together in the decorative stone group in the construction tab.
While the Tuff itself and Polished Tuff aren't grouped together in the stone group in the nature tab.