yeah, I know what you mean. These sorts of issues just appear, and then, maybe vanish. Mine appeared yesterday, long after the MSFS and SDK updates. I have built several bush strips with never a sign of the ‘properties’ issue. Anyway, hopefully, it also eventually goes.
I removed and reinstalled the SDK, but still the same.
I am starting to get used to always right click one or more times before left click opens up the Properties panel.
I am saving scenery and building more often now. if it stops completely.