*Steps to reproduce:*
# Create and open an empty project and install com.unity.behavior
# Create a behavior graph (Assets > Create > Behavior > Behavior Graph)
# Create a game object with a behavior agent
# Assign the graph to the behavior agent
# Make a prefab out of the game object by dragging it to the project view
# In the project view, i.e. prefab asset, set the graph to none
# Click on the prefab game object in the hierarchy and observe the graph assigned to the behavior agent

*Actual results:* the graph field is still assigned to the graph asset

*Expected results:* the graph field is none

*Reproducible with versions:* 1.0.8

*Tested on (OS):* MacOS

*Notes:*
* A workaround seems to be to make edits in prefab isolation mode
* This is also an issue for the blackboard variables
* [Reported by a user|https://discussions.unity.com/t/changing-the-referenced-behavior-graph-inside-behavior-agent-component-does-not-get-persisted/1595803/4]
* There is a slight difference in behavior between versions, but this never properly worked.
* Assigning in the hierarchy is also a problem that needs to be fixed, where it goes back to the graph used in the prefab ([another user reported this|https://discussions.unity.com/t/bug-with-assigning-a-behavior-graph/1595947/2]).