Just for curiosity since I don’t have the addon, I spawned at URMN ramp 6 and aircraft is correctly positioned. So it seems to confirm issue only impact 3rd party addons (eventually handcrafted airport ?).
I have tested with the B737 at EHAM & TNCM, 2 different positions and aircraft was correctly positioned. Don’t know what could trigger a change in the spawning orientation.
In the addon there are 2 Ramp 6 - 6B and 6A. 6A is where the plane turns its nose towards the building, like on your screenshot.
at 6B the nose must look to the right side, instead it looks to the left side.
Currently yes, it concerns only 3rd party (by the way the 1st party URMN is not correct from the beginning, “B” ramps are missing, but this is another case).
It is happening with some default airports too. There are a handful of spots I load in to for testing, and 1 at KJFK the plane was turned about 30 degrees, repeatable. (Stock, no addons)