When you are sneaking, pressing PAUSE or CHAT button make you stand up again.
Step to reproduce:
1. Sneak
2. Press PAUSE or CHAT
3. You stand up automatically (look at the sneak button or go out of 1st person view)
MCPE-11763
Pressing PAUSE or CHAT during sneak make you stand up.
Resolved
Works As Intended
0
This is by design. It works exactly like this on PC Java version.