This will be a question best answered by the Blender experts; one might get their attention by posting here:
https://www.fsdeveloper.com/forum/forums/blender.136/
Sometimes one may get answers here by Arno if issues occur when exporting via ModelConverterX (aka "MCX"):
https://www.fsdeveloper.com/forum/forums/modelconverterx.87/
If I load your model into MCX from this BGL:
[path]\LFEH-avitionblues\Packages\anto609-airport-lfeh-aubigny-sur-n-re\Scenery\airport-lfeh-aubigny-sur-n-re\LFHE3D\LFHE3D.BGL
...MCX shows this:
NOTE: Packages output folder chain does not include a \Texture sub-folder, and obviously will not work in MSFS.
If I manually add the \Texture sub-folder path in PackageSources for your model into MCX, I still get the result above.
But... if I load your model into MCX from this glTF:
[path]\LFEH-avitionblues\PackageSources\Scenery\airport-lfeh-aubigny-sur-n-re\LFHE3D\lfexbat.gltf
...MCX shows this:
NOTE: The PackageSources output folder chain does include a \Texture sub-folder.
IIUC, there is something wrong with your export process in Blender; possibly your Blender configuration / setup ?
You could load the latter glTF cited above into MCX and export for MSFS via MCX as a comparative test.
GaryGB
https://www.fsdeveloper.com/forum/forums/blender.136/
Sometimes one may get answers here by Arno if issues occur when exporting via ModelConverterX (aka "MCX"):
https://www.fsdeveloper.com/forum/forums/modelconverterx.87/
If I load your model into MCX from this BGL:
[path]\LFEH-avitionblues\Packages\anto609-airport-lfeh-aubigny-sur-n-re\Scenery\airport-lfeh-aubigny-sur-n-re\LFHE3D\LFHE3D.BGL
...MCX shows this:
NOTE: Packages output folder chain does not include a \Texture sub-folder, and obviously will not work in MSFS.

If I manually add the \Texture sub-folder path in PackageSources for your model into MCX, I still get the result above.
But... if I load your model into MCX from this glTF:
[path]\LFEH-avitionblues\PackageSources\Scenery\airport-lfeh-aubigny-sur-n-re\LFHE3D\lfexbat.gltf
...MCX shows this:
NOTE: The PackageSources output folder chain does include a \Texture sub-folder.
IIUC, there is something wrong with your export process in Blender; possibly your Blender configuration / setup ?
You could load the latter glTF cited above into MCX and export for MSFS via MCX as a comparative test.

GaryGB
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