[1.8] Adventure's Dream Horse saddle is partly invisible

Partner Rank: 2

Partner Team Reporting: Noxcrew

Verification builds and Platforms: ver. 1.8.4.0, build 1235442, Win10

Summary:
In the 1.8 beta the saddle on horses appear mostly invisible now 

Impact:
This makes the horse model appear to be broken

Repro Steps:

1. Download Adventure's Dream from the Marketplace.
2. Create a world in Creative with the Adventure's Dream resource pack enabled 
3. Type "/summon horse"
4. Tame the horse and place a saddle on it
5. Observe the invisible horse saddle model

Observed Results:
The horse saddle now appears invisible

Expected Results:
The horse saddle is visible 

 

Screenshots/Videos attached: Yes/No

Yes, a screenshot has been attached.

Regression Builds:

This did not occur in Beta 1.7.7.0