I checked my KLMT scenery and there are no tree's on the runway with the default scenery. The runway is unchanged from the original XP database, so the problem should also occur without the gateway airport (can you check ?).
Adding/increasing exclusions zones in gateway airport might not fix your issue - your addon scenery might (should ?) be added at higher priority levels than the gateway airports, in which case exclusions in the gateway airport won't help.
If you added it at priorities below the gateway airport - the exclusion might work for you, but there is also a chance the exclusion removes another object of another addon that is supposed to be there ... so its IMO a bit problematic to modify gateway airports to fix problems with specific addons.
Michael
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I checked my KLMT scenery and there are no tree's on the runway with the default scenery. The runway is unchanged from the original XP database, so the problem should also occur without the gateway airport (can you check ?).
Adding/increasing exclusions zones in gateway airport might not fix your issue - your addon scenery might (should ?) be added at higher priority levels than the gateway airports, in which case exclusions in the gateway airport won't help. If you added it at priorities below the gateway airport - the exclusion might work for you, but there is also a chance the exclusion removes another object of another addon that is supposed to be there ... so its IMO a bit problematic to modify gateway airports to fix problems with specific addons.
Michael