The AT grenade that the UKF Tank Hunters have still does low damage and will not crit the engine.
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The Stuart on the left was hit by the buffed AT grenade and the one on the right was hit by the Tank hunters AT grenade.
I also want to point out that the AECs tread-breaker ability and the Cromwell and Comets smoke shell abilities are not working properly.
If there are any enemies near the vehicles they will prefer to shoot at the hostiles and it takes several tries to get them to use the ability properly without it cancelling.