The night of the event is around 20:30. I swap myself with a Disguiser turned into a Mafioso and kill him with my bus. At this point in the game there is 1 investigator, 2 bus drivers, 1 survivor, and 1 Serial Killer. The other busdriver did not swap me. Earlier in the game that busdriver also hit another mafioso with his bus and killed him. I don't know if he already had the achievement but it is unlikely.
This is not the first time I've technically earned Licence to Kill, but the first time I've saved the replay and reported it.
In reading the forums it looks like this was supposedly fixed, but this game has one (potentially two) instances where it doesn't. This game happened less than an hour ago.
I am 1-S2-1-3493149: KrossGlade
The other is 1-S2-1-2275068: gck
The only reason I can think that the achievement mechanic might have been broken is that there were two bus drivers. However we both earned the achievement. and no amnesiac came into play and there was no other misdirection.
When gck killed with his bus I also swapped myself with him (if I recall correctly). That could be another reason the achievement broke.
Ty. Glhf.