I seem to recall reading this somewhere, but I can't be certain...
When I dispatch several ambulances to a mission that has say 8 patients, sometimes there are patients codes suggesting they can be treated by BLS. However, when I send both to the scene... Often the BLS sit there trying to help an ALS patient (when it can't), yet there are BLS patients waiting to be treated. So I then have to wait for the ALS to get round to the BLS patients.
With that occurring, sending BLS units on scene with ALS is more often than not rather useless. Is this a known bug, or can this be brought up with the relevant people?