Medical not treating victims

I've got an issue of my fly cars and BLS ambulances not treating victims without either a second BLS or an ALS ambulance on scene. I have no idea why but I had all my EMS units on a custom mission that was a mass casualty situation and after my ALS ambulances and one of my BLS ambulances and fly cars left the patients were not longer being treated as the progress bar on all of them stopped and said "ambulance required"

Its been multiple different patient codes that they weren't treating, I sent a combination of ALS, BLS and fly car units for the patients and they went through all the patients one at a time, some weren't even treating anyone while the others focused on the same patient. I haven't had many mass casualty missions since then and the one or two I have since I noticed this issue I didn't pay attention to the codes on the patients.