Concussion Grenade consumes AP and grenade charge without reaching the enemy

I found a bug with the Concussion Grenade ability.

When I activate the ability and target an enemy, the game consumes the required AP and also uses up one of the available grenades for the mission/combat. However, the grenade does not actually reach the target, and the enemy is not affected by the stun.

The action is still treated as completed, so both AP and the grenade charge are lost even though the ability does not produce any effect.

Expected behavior:
The grenade should reach the targeted enemy and apply the concussion effect.

Actual behavior:
AP and the grenade charge are consumed, but the grenade does not reach the enemy and no concussion is applied.

This seems to be reproducible and can negatively affect combat because the player loses both AP and a limited-use ability.