Usually, variant blocks are placed after the original block.

For example, Cracked Stone Bricks is placed after Stone Bricks, and Chiseled Sandstone is placed after Sandstone. However, Chiseled Polished Blackstone is placed before Polished Blackstone. (It appears to position as a variant of Polished Blackstone.)

This is inconsistent with the other blocks.

Steps to reproduce:

1. Go into Building Blocks tab in the creative inventory.
2. Scroll down until you find Chiseled Polished Blackstone.

Observed result:
Chiseled Polished Blackstone is located before Polished Blackstone.

Expected result:
Chiseled Polished Blackstone is located after Polished Blackstone, like other chiseled blocks.