My Personal Comment & Observation
I suspect that the inclusion of light poles to 3rd-party aircraft is not by design but a bug. Now that it has been feedback-logged , hopefully the test team will be able to repro the issue quickly & upgrade the tag to bug-logged , with a fix put in place before SU6 releases.
From the Release Notes - SU6 Beta 1.8.8.0 - July 16, 2026:
- MastLights have been added to a large number of generic airports, ranging in size from M to XXL, with automatic placement. This improves illumination at parking spots at these airports in night conditions.
The 2024 SDK lists six sizes of airport:
0: Extra Small Airport
1: Small Airport
2: Medium Airport
3: Large Airport
4: Extra Large Airport
5: Extra Extra Large Airport
So I think one should see these in any generic airport that is not small or extra small. I’ve not seen any definition of what defines a specific airport size in MSFS (e.g. "small < 10 hectares, large > 1000 hectares) so I think it is up to the airport designer to use the sizes as they see fit.