since SU11 there issues with some callsigns reading incorrectly with the ATC, for example I made a flight from SKBO to KMIA there issues with some airlines callsign (a Satena flight using the ATR callsign instead as the callsign is blank but its not)
There seems to be so many mistakes in SU11, that breaks the AI.
This is sadly an issue with SU11, and not AIG. So we can't do anything, but hope that MS/ASOBO will fix it sooner than later!