I notice this issue is especially prelevant when using "arcane shift" and trying to use bomb on a practice dummy. It will hear a beep with no bomb being placed (the cooldown slightly goes on cooldown to then instantly refresh), and only when the arcane shift next ability boost is over, it will instead become a deny sound effect/visual que on the HUD.
For the extra bit of range that would not be covered with regular bomb placing FYI. 100% reproducible. Arcane shift has been a bit buggy (according to other users) with item synergies, target casts and duration going longer despite it visually showing such.