Cannot lower ground because roller coaster is in the way. But the coaster is above it!

[formlesstree4]

Click here for the save file.

I've got a Wild Mouse roller coaster I am working on. There is a piece of land that is sticking up that looks rather unsightly, so, i thought I would just lower the land:

However, the game disagrees with me lowering it:

The coaster, as far as I can tell, is rendered above it and is positioned above it. So why does the game insist it cannot lower the land?

[Gymnasiast]

Original bug. It's probably caused due to the high end of the land being higher than the lowest point of the roller coaster.

[jensj12]

There are more bugs with coasters and terrain. You sometimes can't raise the land if there is a coaster but you can build the coaster if you've raised the land before.

The coaster builder only checks for the space actually used, but the terrain editor checks for a larger area (in this case even two units larger).

[ghost]

I seem to remember running across this bug a long time ago playing the original game. I'm currently decompiling the relevant code, so I'll look into this. There are quite a few original bugs in the detection of map elements when landscaping.