Sadly I see it. It has been present since sim update 5 beta testing. Even a re-install of Windows 10 and fresh install of the sim has not solved it - Edinburgh shows the same issue as well as other cities. Removing procedural buildings from the UK world update is a workaround of sorts.
There are several other threads on the same topic and perhaps the moderators (@tamalien) could merge and combine votes. Some examples:
Buildings are boxes after SU5 and 2 Hotfixes - Bugs & Issues / Scenery - Microsoft Flight Simulator Forums
(See pics of Castle Donnington early in that thread)
All settings ultra on a 10700K/RTX3090/32GbRAM/1Tb NVME. Fresh Windows 10. Fresh MSFS. No other apps installed. I’ve tried rolling cache on/off, switching settings Ultra->Low->Ultra - nothing helps. I believe its a server issue as at times it is worse than others. Ticket raised with zendesk.
‘Lego’ land!
p.s. Windows 10 re-install was due to leaving Windows 11 Insider Program and not to solve this issue 