However, msfs built is the same as when it was all working, and all the sceneries involved were not modified since the time the problem appeared.
So either you’re right and msfs changed its behaviour with the sceneries and for whatever reason has applied this mod only after full reinstallation of the same version, or something got broken after.
I reinstalled all of them, checking whatever was possible.
By removing LOWI all works. For sure I will not reinstall again hundreds of Gbs just for a couple of powerlines and a missing selectable parking on one airport. 
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You may be right that they changed it, I can’t really say because I only switched my community etc. to D: sometime after SU5. However I still say there’s nothing fake, until the installer knows the right path it always shows a huge amount to download but it is always quick to correct this once it’s been given the valid one.