Well, I was unable to reproduce the bug in single player mode. Today I'll play with a friend. Let me check if the bug still appears.
Wow, that's weird. I use not one, but two custom texture packs (one is a shader) at the same time and I don't have this issue. I wonder if something about your devices causes this problem.
My friend is not able to play by now. Sorry for the waste of time, and thank you.
The next time I play with him, I'll check if the bug still appears, and this time without any texture pack. If it does, I will create a new report.