Lose items in chest when logging off

Put the summary of the bug you're having here

What I expected to happen was...:
I expected stuff I stored in my chest to be safe.

What actually happened was...:
When I resumed play the stuff I stored in my chest was gone - a diamond pickax and a stack of obsidian. This has been repeated

Steps to Reproduce:
1. Put stuff in my chest to keep it safe
2. logged off
3. logged back on to resume play

Stuff is missing. Because of this and other bugs I uninstalled minecraft win10 beta