BehaviorTree not executed in build

hi,

i have player controller which possess a pawn. In widgets i spawn custom BotController (derived from AIController),
i set Blackboard and BehaviorTree on that character, unpossess character, and possess it with BotController and i do RunBehaviorTree on that.
It does work in Editor, but when i start this in a build it does not work. BehaviorTree does not get executed in a build, everything else does.

Anyone have idea why this is happening?