The latest patch apparently made my plot smaller, invalidating the structures I was building on it. I had a plot sized 32x48, now it is 32x42 in Istarias Loom on Genevia.
It means I can not see my structures on the "Under Construction" list, so I can't tear them down or build on them. It goes for all structures on my plot.

Not a big issue for me, as I had just started on it a few days ago. I will just sell it and buy another one. But perhaps others should check their plots to see if they are hit with the same issue.