[W|0.5.492] Floating roof apparantely at map generation

[zollern]

I recently found a floating "constructed roof" near a small rock formation in my game. I never built in its vicinity. As far as I know, no raiders attacked from there. There was no siege or the like. I did find it in May of year 1, so I'm not sure whether it was generated at map generation or afterwards. I can upload the save file, if necessary. Attached you find a cropped screenshot of the region. Obviously, I can't give any steps to reproduce, but here's what I guess is the map hash from the save file, maybe it helps.

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<mapInfo>
<name>Ellis</name>
<size>(250, 1, 250)</size>
<maxThingIDIndex>353474</maxThingIDIndex>
<generatorDef>XericShrubland</generatorDef>
<gameplayID>bTgd3UMqF3Q23RuOHVDv</gameplayID>
</mapInfo>

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