Played on Xbox Series X with online mode and photogrammetry on:
Could be error, it could be internet connection. Mine was a bit ropey last night and I was flying over Paris and it seemed to have replaced some buildings with metallic pyramid structures.
The pattern looks like a colour overlay has failed maybe ? The basic 3D structure is there, but the image that overlays it and gives it the colour and shadow isnāt.
(This made be grade A nonsense btw)
Didnāt they re-do a lot of the scenery for SU5? Lowered the texture resolution and remeshed the models for lower poly count?
Iām guessing that in the mix a lot of stuff got messed up. The missing textures in this image may be part of the same issue which causes missing airport terminals and autogen buildings elsewhereā¦
At least I can say that this generally doesnāt look like that (at least on PC).
Recently there was a Community Fly-In from Carcassonne and this old town looked correct (we flew circles around it, so from various distances and directions.
Hereās a screenshot I took back then, you can see the amphitheatre in the center that is magenta in the opening post:
Not sure what is going on in this case.
This is handcrafted scenery which is part of the downloaded world update package, so it shouldnāt be downloaded but present locally if you have the according world update installed.
The last time I saw anything pink in scenery was when I first installed the game in July on release. I went to my local airport - Glasgow to check it out and there were pink patches dotted all over the airport. At this point I hadnāt downloaded the world update for UK/Ireland (I didnāt think I needed to as I was just checking out the base game) but once I did install the world update the pink areas were no more. Iāve not seen any since either.
Check your Content Manager and make sure thereās nothing in the Updates Available category.
Thereās lots of pink areas in Glasgow anyway, isnāt there 
Thereās a big pink āpeople make Glasgowā sign in George Square if someone ever does an in depth scenery enhancement it could look like a missing texture =)
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This is how downgraded it is now the Blackshark AI buildings. Even near EHAM and Rotterdam the AI buildings are broken and downgraded
Ive seen this blocky AI buildings never before but after SU5 its been like this almost everywhere. Its disgusting tbh. Real immersion killer
Canāt confirm and actually your screenshots show that there are regular buildings rendered as well.
The flat ābuildingsā are simply flower growing facilities in the Netherlands and donāt look far off their real versions. Hereās how they look on the satellite imagery.
Also your post is off topic here since this post is about Carcassonne and purple textures which both do not match your screenshots.
You talk about Blackshark, but Blackshark is not involved in the handcrafted old town model/texture in Carcassonne either.
Iāll check today.