This filter seems to also change some architectural details and features, as well as degrade the quality of some materials in an unrealistic way.
It's GenAI. It does something that's kind of like what you asked it to do, but it will skip some details or add other ones or whatever.
Dreary architectural pictures will be more likely to have electrical boxes, poor materials, etc, so when it moves the buildings from the latent space for cheery bright architectural renderings to dreary wet November architectural renderings, it will be more likely to add some of those details, because that's what's in its latent space.
Don't expect GenAI to be magic.
Au contraire, in a rather realistic way
That's the 'built by the lowest bidder' feature. Probably pretty realistic in a lot of places.