Use the command’s owning target when TargetReferenceId is unset.
This boolean flag (bool) belongs to UInteractionCommandSetTargetEnabledAction under Interaction|Execution.
Blueprint or editor workflows can write this value when constructing, overriding, or customizing the owning object.
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Interaction|Execution")
bool bUseCurrentTargetWhenReferenceUnset = true;