Nothing that can possibly caused this has been changed in GSX, since the one and only updates were related to the deicing vehicles
While in the air, the only thing GSX does is to periodically ask for a least of nearby airports using Navdata. Nothing has changed in this update to that either, but of course the number of airports returned by Simconnect will wildly change depending on the area flew, so you can be easily misled thinking "it only started to happen now", but maybe you just flew in an area with more airports.