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MSFS Wrong polygons appearance

Trying to place some polygons to my MSFS scenery project using SDK I noticed they appear incorrect inside the sim after building the package and place it inside my Community folder even though inside SDK they appear correctly!No matter what material I use to assign to the polys the outcome is always the same.I even tried to give a higher priority ("1") to them to no avail.Does anyone knows if it's an SDK bug or I'm missing something here and do something the wrong way?Strange thing is there are some of them appearing correctly while others (most of them) are heavily distorted.

Many thanks for any possible help!


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I thought I read a post where someone said MSFS "likes triangles". Now, not being any kind of expert, I'm not sure that applies in your situation.