2 times I had a CTD (terrain.dll) before landing on rwy 22/23 in GVA now.
Cannot reproduce the problem, as you can see in the video below: I flew from LFSB to LSGG with the Microsoft A321 imported from FSX, and no 3rd party Mesh or Landclass installed:
I'dont have this issue at any other airport.
Fact you don't have a crash anywhere else, doesn't mean the problem is caused by the airport.
A crash in terrain.dll usually means a problem with a Landclass or a Mesh in that area, maybe a missing/corrupted texture for a specific kind of Landclass the 3rd party product has redefined, that is not found elsewhere ( of the airports you tried ), and this can easily mislead you the airport has a problem, because you won't noticed it anywhere else.