Start the training campaign.
Start the training mission "Heavy weapons".
After receiving the task to destroy targets using the M203 (under-barrel grenade launcher), destroy the first target at the shooting range.
After that, the second target will be impossible to destroy (first bug).
Climb over the parapet onto the target field and move away a bit until the instructor starts swearing.
After that, the current target will disappear and a point for returning to the shooting area will appear.
Follow the instructor's command and return behind the parapet to the shooting position. Targets will no longer appear (second bug).