I had a similar issue - I wanted to execute something at “AI Start” just “once” in the behaviour tree.
So what I did was, created a Boolean in the Blackboard called “Start Logic Executed”,
Used a Blackboard Key Decorator which aborts self when this bool is true,
Created a simple service “Set Blackboard Value Bool” where it modifies the Blackboard Key “Start Logic Executed” to True.
Now it just executes it just until my service tells it that it’s been done executing.
