It does happen, though in some cars, it is not that noticeable. It is not an issue. Just that when hard acceleration is required, the compressor is disengaged for a little time, generally a second or two. It will not have any noticeable effect on the cooling of the AC. You can check it this way: Open the hood with the car started and AC on. Look at the compressor. You will see that the belt is driving it, but the outer part (clutch of the AC) is also moving with the motion of the belt. Now, suddenly rev the car. As the car is revved, you will see that when the RPM increases, the clutch disengages the compressor and it stops moving. The belt is moving as it is, however. When you stop revving, the clutch will engage again.
This is why when you go for AC service or they have to check AC cooling, the car is slowly revved to moderate RPMs and not revved heavily. In theory, high revving should depict AC cooling in a better way. But since the clutch disengages, there is no cooling. Hence the slow increase of RPMs to moderate levels to check the effectiveness of AC.
