Do you have the same issue if you follow the OP’s steps to reproduce it?
Yes, partially.
Provide extra information to complete the original description of the issue:
A lot depends on the aircraft’s distance from the buildings. As I wrote in this post, “Not the nuclear wasteland that the OP posted above, but some of the high-rises & especially the cranes look pretty bad if you fly too close to them.”
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IMO, the sim is actually working as designed but, as others have noted, London has poor photogrammetric data. Higher resolution data and some custom-made models for the more prominent buildings would fix most of the egregious representations of the city. See-through items such as cranes, bridges & trees may need a better-trained AI algorithm.
If relevant, provide additional screenshots/video:
Screenshots and the specs of my PC were provided in my post linked above.