Waterlog a button.
Use an empty bucket on one of the block sides the button isn't on.
The block will not un-waterlog like expected
Linked issues
Comments 2
Thank you for your report!
We're actually already tracking this issue at MCPE-56024, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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To un-waterlog blocks you need to aim at the hitbox of the block, so for buttons you have to sneak and aim at the button and then press left click. You have to do this with every waterloggable block.
This issue also confused me with doors and ladders. So I also thought that I am unable to un-waterlog These blocks until I found out that I have to aim at the hitbox of the block itself.
This issue might be a bug, but I am not Sure.