Player's inventory shows black colour background for player but shows gray color background for rideble entity inventory

Player's inventory shows black colour background for player but shows gray color background for rideble entity inventory.

Steps to reproduce: 

1. Launch game
2. Creat world or open existing world 
3. Open player's inventory then click on Armor button
4. Now see any other rideble entity inventory

Observations:

You will see that player's inventory shows Black colour background for player model but in rideble entities grey coloured background can be seen.

Expected results:

Player and rideable entities have same colour for background of model.