I have noticed a few times that ATC commands with RC4 are not synchrinised fully with the AI traffic being commanded.On taxiing to runway for takeoff, I noticed an aircraft land on the runway. Immediately afterwards I heard that aircraft call up (on RC4) as being 2 miles final and given landing clearance!! There were no other aircraft on approach, or other than myself, anywhere near the runway.Although slightly less of a problem, I have also seen this happen when aircraft requests taxi clearance after it has left the gate.

there are times where AI just "appear", which is also unrealistic. but it is hard for me to tell when someone has just appeared, and when they've been there a while.though the ai chatter isn't perfect, i'm working with the ai, after alljd