It's similar to MCPE-57531 but I do not think it is the same.

When flying in creative, even though we did not have the crouch button, we could press the fly up and fly down buttons (at the same time) to sneak and place block on interactive blocks.   This doesn't work anymore.

steps to reproduce:

1. go in creative
2. place a chest (or other interactive blocks)
3. fly
4. press the fly up and fly down buttons
5. while doing this, try to place a block on the chest   

What used to happen: 

The block is placed.

What now happens:

The block's interface is opened and no block is placed.

this bug is a big problem for building in creative, especially when doing redstone.

It even makes some creations impossible (or just very hard) to build, and slows us down.