Setting enum variable does not always work

Steps to reproduce:

1. Create and open an empty project and install com.unity.behavior
2. Download and import the attached "repro.unitypackage"
3. Open "scene"
4. Enter play mode
5. Observe the console

Actual results: The console prints "val 1"

Expected results: The console prints "val 2"

Reproducible with versions: 
1.0.8

Tested on (OS): MacOS

Notes:

• When modifying the "NewEnum" line from "Val1," to "Val1 = 1," I noticed that in the behavior agent component inspector the enum dropdown value was showing as empty.