thermal scopes can't see through glass

its self explanatory.

I ve seen people have mentioned but also:
class challenges doesnt count properly too, like airburst damage for medic and launcher damage to aircrafts of engineer 3 challenge. Not sure but maybe it only counts the damage when the crosshair is on the target without measuring the  movement and projectile drop. like choppers and soldiers gotta take the damage while on your cursor. and smoke grenade is missing from my loadout :( cmon guys just revise all of these challenges and fix it at once for all