Default ground parameters bleeding through airport custom scenery

Version: 1.3.10.0

Frequency: Consistently

Severity: High

Context: Airport Package

Similar MSFS 2020 issue: Does not occur in MSFS2020

Bug description:
There appears to be default ground parameters bleeding through. In this screenshot example, the default scenery shows grass exclusion along this airport service road. When our airport is loaded on top of this, the grass is still excluded, even if we try to add a grass layer. There is currently no possibility of excluding this. It’s happening to all of the airport service roads in our product and it looks terrible.
We must be able to exclude any default terrain or exclusions

Repro steps: Load any airport, eg: KSFO. Load addon airport and observe service roads

Attachments: