So I am playing Mission VI (Vet, XBOX) and my Sergeant stands with his back against rubble ... and I can Interact with the rubble (0 cost and nothing happens)? Another bug?
Rubble is something you can destroy.
You therefore need to shoot at it or use a melee attack.
Interacting with a console can open doors and program turrets.
Interacting with rubble with just give you dirty armour.
Shoot or smash.