Reported here: https://discussions.unity.com/t/multiple-subgraph-instances-make-it-difficult-for-me-to-pass-variables-between-graph-and-subgraph-correctly/1562005

*Steps to reproduce:*
# Open an empty project with Unity 6.0.26f or above
# Install {{com.unity.behavior@1.0.6}}
# Import the provided repro .unitypackage to the project
# Open the Subgraph scene and run the scene
# Select Cube1 and check Blackboard Variables.Rotate in the Inspector panel. This means that Cube1 will rotate 180 degrees along the Y axis within 2 seconds
# Select Cube2 and check Blackboard Variables.Rotate in the Inspector panel. This means that Cube2 will rotate 360 degrees along the X axis within 4 seconds
# Select Cube1 again and find that the Blackboard Variables of Cube1 are overwritten by the Blackboard Variables of Cube2

*Actual results:* 
* Blackboard Variables of Cube1 are overwritten by the Blackboard Variables of Cube2
*Expected results:* 
* BehaviorAgent Blackboard Variable are not overwritten by other agent using the same graph.

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*Reproducible with versions:* 
Unity 6.0.26f
*Not reproducible with versions:* 

*Can’t test with versions:* 

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*Tested on (OS):* 

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*Notes:*
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