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MSFS Apron layers/falloffs/ground merging broken after build

Hallo there everyone; I was hoping my first post would not be a question regarding difficulties with the SDK but here we are...

I recently went above and beyond (and crazy) with aprons and building of ground textures for the project of my local airfield. In DevMode, everything looks exactly as I would like it to look, however, after building, the
a) ground merging is suddenly more extreme than when viewed in DevMode
b) layered falloff aprons are suddenly at falloff 0 (or at least look like it) with sharp edges etc.
c) A two-layer-setup, layer 0 with base color, layer 1 with opacity 81 of /256 is the only one with ground merging, smaller and with small falloff, however the ground merging effect continues over the whole layer 0 apron.

I double-checked the layers to make sure there is no z-fighting going on; even with 2-layer-spacing the result is the same. I'm out of ideas (after 2 days of testing). Anyone having any ideas? Thanks in advance for any input you can give.

Cheers and best regards!

ABOVE: Apron with layers and ground merging (low-opacity) in DevMode. BELOW: After build


ABOVE: Layered dirt/dust in DevMode. BELOW: After Build


ABOVE: Ground merging layers shading DevMode, BELOW: After Build


ABOVE: Layers with Ground Merging smaller poly than the surrounding one, yet BELOW: Merging extends to the whole apron below
Update on this: Seems like MSFS doesn't like low-opacity layers over baselayers with groundmerging. Got rid of it and the merging errors were fixed. Interestingly, increasing the layer spacing on the other issues to 10 layers solved those, too... Anyone up for a group therapy?