Behavior tree subtree switch reported as hitching

Setup described in UDN post:
parent tree: root - selector - run behavior task
subtree: root - sequence - custom BP task with just print string

repro: print string message (engine tick) is showing up less often during PIE than standalone game

Only difference I can think of is sync with behavior tree debugger, maybe it's slower than expected during PIE.

1. create two behavior trees as in description / UDN post
2. start any map with AI using parent tree, PIE or simulate
3. on screen prints are noticeably slower after ~5s if behavior tree editor window is opened

[UE-23848] Bug Status

Fix UE-51650

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