It seems like there are different models of harvester in use by the aliens. In some missions, the harvester has sort of backswept beveled protrusions near the doors at the rear, providing a larger area of cover. In several other maps, these backswept extrusions are missing and there is only a blank, sheer wall.
Is this intentional, do the extrusions retract into the harvester or is this some other kind of mismatch?
See attached screenshots for examples.
Unfortunately, no console logs on what was loaded for these missions.