When shift-right-clicking a tamed horse with a block it will place the block and not open the inventory of the horse

What should happen:
Shift-right-clicking the horse will open its inventory.

What actually happened:
It placed a block then it quickly disappeared (if it was beneath the horse).

Steps to reproduce:
1-Spawn a horse.
2-Tame the horse.
3-Shift-right-click the horse with a block.
Note that it didn't open the horse's inventory.