MassInKg override resets to 0

In the details for a Static Mesh Actor, MassInKg resets to 0 when the user tries to set it to something else.

I couldn't reproduce this issue in 4.13.

1. Open QAGame in editor.
2. Add a static mesh to the level.
3. In the mesh's Details, click the checkbox for MassInKg.
4. Set a value to something other than 0 and press Enter.

RESULT:

The value resets to 0