When you stand on a Shulker Box, jump and open it. During the animation (Assuming this is where the block's hitbox is changing), you'll fall through the block and end up inside it.
See the .gif for a demonstration of the bug.
Linked issues
is duplicated by 2
relates to 1
Attachments
Comments 5
Relates to MCPE-28812
This bug has been reported to our internal bug tracker for further testing and a fix. It is scheduled to be fixed in one of the future updates (no specific date can be provided).