here is links to videos of bug:

1:https://youtu.be/NSLxhGPfs3Y

2:https://youtu.be/XpVMr6D-ll4

What I expected to happen was...:
Checking shulkerbox

What actually happened was...:
From random jump and closing shulkerbox just in one time i got fall damage

Steps to Reproduce:
1. Try stick close to shulker from any angle i think
2. Open box and close with jumping

These steps not always works.

P.S.: The world i was playing is Skyblock Randomizer Challenge v1.1. And also i have very bad PC(Laptop), maybe bug caused by wrong work of PC, idk.