Tested it quick, this is a map object bug rather than a unit one. Any unit will be affected when close to that truck (there's another one in the castle ruins on this map, and it's probably used on some other maps too).
is_shoot_through is set to true on opel_blitz_parked even though it should not be. This makes the game apply the object's cover (in this case, green cover) to any target that is fired at through the object. So you're effectively firing at green cover when you have a unit firing from behind that truck.
It's supposed to be only set for smoke cover, but as we have come to expect it is used wrongly plenty of times in the files
Show Spoiler
Search "is_shoot_through: true;" (69 hits in 69 files)
ebps\environment\art_ambient\objects\defenses\metal\hedgehog_02.txt (1 hit)
Line 133: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\defenses\metal\hedgehog_03.txt (1 hit)
Line 133: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\defenses\metal\ibeam.txt (1 hit)
Line 133: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\defenses\metal\soviet_tank_trap_01.txt (1 hit)
Line 133: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\industrial\concrete\tank_assembly_floor.txt (1 hit)
Line 123: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\posts\lamp\lamp_simple_01.txt (1 hit)
Line 114: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\posts\lamp\lamp_simple_02.txt (1 hit)
Line 114: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\single_player\coh2\poznan\fortress_large_iron_gate.txt (1 hit)
Line 133: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\single_player\coh2\red_october\factory_gate.txt (1 hit)
Line 109: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\single_player\mission_6\port_facility_walls_01.txt (1 hit)
Line 114: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\statues\lion_01.txt (1 hit)
Line 149: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\terrain\snow_clumpy_edge_01.txt (1 hit)
Line 112: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\vehicles\military\opel_blitz_parked.txt (1 hit)
Line 183: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\walls\metal\barbedwire_fence_l_01.txt (1 hit)
Line 133: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\walls\metal\barbedwire_fence_s_01.txt (1 hit)
Line 133: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\walls\metal\barbedwire_fence_s_02.txt (1 hit)
Line 133: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\walls\metal\large_iron_gate_01.txt (1 hit)
Line 131: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\walls\metal\poznan_iron_gate.txt (1 hit)
Line 133: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\walls\metal\v2_gate.txt (1 hit)
Line 133: | | is_shoot_through: true;
ebps\environment\art_ambient\objects\walls\metal\v2_gate_capturable.txt (1 hit)
Line 133: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_l_01.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_l_01_snow.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_l_01_summer.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_l_02.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_l_02_summer.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_l_03.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_l_03_summer.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_01.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_01_snow.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_01_snow_fall.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_01_summer.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_02.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_02_snow.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_02_summer.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_03.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_03_snow.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_03_summer.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_04.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_04_snow.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_04_summer.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_07.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_07_summer.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_08.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_08_summer.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_09_snow_fall_sb.txt (1 hit)
Line 146: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_row_09_snow_sb.txt (1 hit)
Line 146: | | is_shoot_through: true;
ebps\environment\art_nature\bushes\bush_s_01.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\scrub\branch_pile_01.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\scrub\branch_pile_02.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\scrub\branch_pile_03.txt (1 hit)
Line 144: | | is_shoot_through: true;
ebps\environment\art_nature\scrub\driftwood_l_01.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\scrub\driftwood_m_01.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\scrub\scrub_bush_m_01.txt (1 hit)
Line 144: | | is_shoot_through: true;
ebps\environment\art_nature\scrub\scrub_bush_m_02.txt (1 hit)
Line 144: | | is_shoot_through: true;
ebps\environment\art_nature\scrub\scrub_bush_red_m_01.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\scrub\scrub_bush_red_s_01.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\environment\art_nature\scrub\thick_bramble_01.txt (1 hit)
Line 152: | | is_shoot_through: true;
ebps\gameplay\designer_objects\objects\walls\bushes\1x3_light_cover_passable\1x3_light_cover_passable.txt (1 hit)
Line 150: | | is_shoot_through: true;
ebps\gameplay\smoke_cloud.txt (1 hit)
Line 41: | | is_shoot_through: true;
ebps\gameplay\smoke_cloud_airborne.txt (1 hit)
Line 51: | | is_shoot_through: true;
ebps\gameplay\smoke_cloud_concealing.txt (1 hit)
Line 41: | | is_shoot_through: true;
ebps\gameplay\smoke_cloud_grenade.txt (1 hit)
Line 41: | | is_shoot_through: true;
ebps\gameplay\smoke_cloud_mortar.txt (1 hit)
Line 43: | | is_shoot_through: true;
ebps\gameplay\smoke_cloud_phosphorus.txt (1 hit)
Line 41: | | is_shoot_through: true;
ebps\gameplay\smoke_cloud_wreck.txt (1 hit)
Line 43: | | is_shoot_through: true;
ebps\gameplay\smoke_los_block.txt (1 hit)
Line 43: | | is_shoot_through: true;
ebps\gameplay\smoke_los_inside_block.txt (1 hit)
Line 43: | | is_shoot_through: true;
ebps\gameplay\smoke_mortar_los_block.txt (1 hit)
Line 43: | | is_shoot_through: true;
ebps\races\german\buildings\defensive_structure\sniper_digin_cover_mp.txt (1 hit)
Line 192: | | is_shoot_through: true;