Steps to reproduce:

1. Simply doesn't work. 
2. It shows in item history correctly, when I open item from latest data.
3. But it should show mapped representation in the Latest data item list as numeric value mapping works.

Result:
See screenshot...

Item Prototype configuration:

Value mapping:

How it looks wrong in Latest data:

How it looks correct in latest data item history:

See log file...
See memory dump...
Expected:
See screenshot....
See attached patch file...