[1.7] blocks.json is not respecting "isotropic" settings

Verification builds: 1.7.0.2 R7 Beta 21

Summary: Typically when you want to disable random rotations on a specific block, you would go into the blocks.json file in your resource pack and add the setting: ``"isotropic": false`` to the compound for that block. This was recognized properly in previous versions including 1.6.0.8 but not in 1.7.0.2

Impact: Major aesthetic impacts to most resource packs.

Repro Steps:

1. Download the world attached to the testing report from TRS in Slack.
2. Enable cheats
3. Open the world and go into creative mode.
4. Place down 10 of each of the following blocks all in a row:
   1. All 16 colors of Stained Hardened Clay (aka Terracotta)
   2. Glowstone
   3. Red Sandstone

Observed Results: All the blocks listed in step 4 are given random rotations on their textures.

Expected Results: All the blocks listed in step 4 should have the exact same texture rotations regardless of where or how many times the block is placed.

Screenshots/Videos attached: White Terracotta (aka White Stained Hardened Clay) is pictured here

Screenshot from 1.7.0.2: 

Screenshot from 1.6.0.8: 

 

Regression Build: 1.6.0.8