If I might?
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https://forums.funcom.com/uploads/short-url/ul9dAXVFqR68wkxszMb4UHYgNOk.jpg
It’s because of stability. For whatever reason the support beams wont be calculated when the building is loaded (or even decay? idk). Thus the parts which rely on support beams will fall apart on each serverdown.
The red stability comes from the wall, the green from the support beam.