When picking up item, then it goes for a second away from screen.

When you pick any item/block up, then it "refreshes" or goes away from screen some time.

Stage 1.png - Before picking up
Stage 2.png - ...picking up... (also you can see from hotbar that I just picked it up)

Video - https://www.youtube.com/watch?v=OKtOWvGD6g8