Yep, this is a well-known and sadly very exploitable glitch.
All we can hope is that if there will ever be another update, this will be fixed for good.
“All warfare is based on deception. Hence, when we are able to attack, we must seem unable; when using our forces, we must appear inactive; when we are near, we must make the enemy believe we are far away.”
― Sun Tzu, The Art of War