Plot thickens on this one. Without knowing much about the recent code changes, this feels to me like it might be related to the building editor merging different buildings together when they touch one another. I designed out some roads, and a handful of building templates with the intent to click on a building or two at a time and build it out a piece at a time. But because the roads touch each building’s door, and because the roofs are close together their overhangs touch each other in a few places, therefore the building editor decided that every building and the road were all the same huge building.
So I of course decided to try and build it to see how far along they’d get. They didn’t get far. They built a couple tiny sections of road and then ignore the rest entirely.
In that way, it relates to this, but because I am also seeing this fixture fabricator bug, it feels different (but still related).