I can confirm that GSX is causing the CTDs. I have tried to perform 3 flights today. 2 of those flights got a CTD when I have started taxiing.
And lo and behold, I have disabled the GSX, and MSFS runs with ZERO CTD. All of those 3 flights were performed exactly the same. Same stand, same scenery, same addon.
My specs: i7 9700K, 32GB RAM, RTX3070Ti, SU9
So IT IS caused by the GSX. PERIOD...