It seems like the same bug FS2020 had.
Which was that the windsocks (and wind turbines) by default are ‘facing’ 180 the wrong way. Their default heading is 000 degrees, but the sim’s errors make that incorrect. This needs to be rectified.
The work around for now is that scenery designers need to rotate their windsocks 180 degrees, then they indicate correctly. It’s less than ideal, but I can’t see Asobo fixing this any time, sooner or later.