When interacting with a consumable, it has a animation which smoothly transitions it to the middle of the screen. This animation is interrupted by the item equip animation which moves the item off screen and then back up. In "Current Transiton.mp4", the end of the video briefly plays the animation correctly. The "Correct Transition-1.mp4" is recorded on vanilla release 1.8.9

This is not to be confused with this bug report: MC-129289 as it is a separate issue. I did research and I found this vaguely similar to the topic so I wanted to clear things up just in case.