*Steps to reproduce:*
# Create a game object with a behavior agent component
# Create a behavior graph and assign it to the agent
# Open the behavior graph
# Add a "Log Variable" node
# Connect the "Log Variable" node to "OnStart"
# Set the variable to log to "Self"
# Save
# Undo
# Save
# Enter play mode

*Actual results:* "[Agent] Self = Agent (UnityEngine.GameObject)" is logged to the console

*Expected results:* "[Agent] <no name> = null" is logged to the console

*Reproducible with versions:* 
1.0.9

*Not reproducible with versions:* 
1.0.8

*Tested on (OS):* MacOS

*Notes:*
* The attached screen recording shows it the other way around, but it's the same issue
* You can open project settings and add {{BEHAVIOR_DEBUG_ASSET_IMPORT}} to Scripting Define Symbols (domain reload will happen) to verify if the graph rebuilds when saving (You should see "GraphAsset[{*}Behavior Graph{*}].BuildRuntimeGraph" in the log window)