Climbing on a chest from a half slab in low position

You're most likely walking up the slab then jumping on the chest. Cannot reproduce jumping from the floor slab to on top of the chest.

How can i send a video to show you? In first i hit the chest, after i'm in falling along the chest and i'm teleport on the chest

Can't reproduce this with my own testing are you sure you arn't jumping from the slab thats under the chest?