Defeat 50 Troopers with Hera Present Quest

The "Defeat 50 Imperial Troopers with any version of Hera Syndulla present" journey quest isn't recognizing all trooper kills. I've run it three times on Mod Battle 9-A, which has 10 troopers across the 3 waves, but it's only giving me credit for 4 troopers per battle (presumably the 4 in the first wave).

The screenshot is after 3 runs of that battle.