Assorted oddities: stairs, swaps and soundīeyond vents, GO’s maps exhibit some further irregularities in design, including smaller but noticeable differences in the way stairs behave.
When trying to recover the bomb, make sure the smoke overshoots the bomb’s position slightly. To reduce the chances of showing up, try to make sure you stick to the centre of the smoke or the far side of your opponent.
Visibility of the bomb through smoke grenades is wildly inconsistent, but seems dependent on the bomb's position relative to the grenade.