Hello, I lost some hours on this.
I have a Behavior Tree BT_MacroAI that use BB_MacroAI as Blackboard.
And I have a Behavior Tree BT_MoveAndGrabMicro that use BB_MoveAndGrabMicro as Blackboard.
If I play the game BT_MacroAI fail at Run Behavior without reason.
But If I change in BT_MoveAndGrabMicro the Blackboard from BB_MoveAndGrabMicro to BB_MacroAI it work. BB_MoveAndGrabMicro use BB_MacroAI as parent.
This is a bug?