the quartz block textures are still unchanged from before the flattening and 1.14 (which introduced smooth quartz)

the smooth quartz block texture is named quartz_block_bottom despite not being used for the bottom of the quartz block ever since smooth quartz block was introduced 

and the quartz block has 2 textures for the ends and sides, despite those 2 being identical. no other polished looking block does this.