For anyone still following this topic, we did get a response from Asobo on this matter:
I was finally able to have a reliable reproduction of the bug.
So we now have something to investigate further.However, this system being rather complex and our first few investigations showing the issue runs deep into it, I don’t expect us to be able to provide a fix shortly.
I will let you know as soon as we move forward on this.
In the meantime, possible workarounds are to change airport packages priorities (latest mounted packages are less likely to have the issue as far as we could see) or, as you mentioned already, having less than 8/9 packages with CGL in the same area (Level 6 in the Bing Map tile system)