Player is able to still use the horse ui although not on it

When the player is sitting in a tamed horse and than clicking inventory and dismount button at the same time, the horse ui still shows and is functional

Steps to reproduce:

Get a horse and tame it

Equip saddle and horse armor

Simultaneously click the inventory button and dismount button

Expected result:

Player should be accessing his/her inventory

Actual result:

Sometimes it still shows horse ui and is functional