The wrong player controls the delayed trigger abilities for flickerwisp and charming prince
If I own flickerwisp or charming prince, and I play it from my hand, then I control the ETB trigger. Therefore, I should also control the delayed trigger that the ETB trigger creates. That is not the case on mtgo in situations where my opponent somehow gains control of flickerwisp or charming prince by the time the delayed trigger is about to be put on the stack. This affects stacking order.