Mars Spear Lith Defense Mission Enemies stop spawning

[smashedtuba28]

During a Lith defense mission at Spear on Mars, I was playing in a squad of 4 with Frost Prime, Volt and I can't recall the two other Frames, when the enemies stopped spawning during wave 9. Wave 10 never started and no new enemies ever spawned. Looked all around the map using a codex scanner for any enemies stuck in walls, yet was unable to find any. There were no host migrations during the mission.