I know it may sounds like nothing, but Dijon and Bourgogne is where I am from, and it’s very historical to have such mosaic roof !
You can have here the french wikipedia about those special roofing.
Here some pictures :
I could totally see this kind of roofing on the existing building shown in the screenshot :
I know it takes time, I’m also aware the expansion is already shipped to be released, but I wish FE would take time to actually makes slights changes to the roofing for the Burgundian buildings (just the roofing, not the whole building), considering it’s also a paid expac, and they’ve already added a different Castle.