Within the multi-part ION showcase, the scenario where you defend a squad from a rooftop while waiting for an ION Marshall to show up can become broken if an enemy solider manages to critically damage (but not destroy) the Marshall. This forces the crew to bail out and infantry refuse to board.

This is compounded by the fact that damaged vehicles (and apparently some of the infantry too) dont get reset during "Reset Simulation". If you do reset the simulation, or fail it, or die, new vehicles are spawned in on top of old ones, exploding the old vehicles. In the case of the Marshall, this subsequently critically damages the new rescue Marshall and youre locked in a damaged-Marshall loop. This seems to make the showcase non-finishable.