The bug
This is not a duplicate of MCPE-32638, but it clones that ticket. This is a parity issue, since this was fixed for java in 1.16. MC-667 Normally you can’t place blocks inside yourself or other entities, however lily pads can be placed inside entities.
How to reproduce:
Go into a sea or an ocean and be at the top of the water
Try to place a lily pad inside yourself
Observed Result: The lily pad is placed and you will get pushed away from it.
Expected Result: The lily pad doesn’t get placed, since it would be placed inside you.
Related issues
relates to
Attachments
Comments

Still present in 1.16.210.56
Also, this bug affects not only the XBOX platform. I think it is on all platforms) (I tested it on Windows 10