Simutrans 111.0: Bug while placing new curiosity

[Emil Sawicki]

I can't find similar thread, so maybe I'm first to reporting auto-terraforming bug.

I noticed that Simutrans can terraform ground while placing new curiosities, but this behavior can cause bugs. I igonred few of them, and there were the same errors like this.

There is a slope next to the river. Game removes the river, extends the slope and then places a building.

EDIT: when I tried to remove incorrect slope, program returned text "Clear field before using slope tool". Under slope was the river.

[Dwachs]

I guess this building was built by simutrans? and not by yourself using the editor tools?

Edit: I have no clue what could have caused this. Such buildings are always built on vertical slopes if necessary 

[prissi]

MAybe the river was added later? Then the terraforming could have failed partly.