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[Pirate Santa]

Okay so I opened the clown car today. The results were quite odd.

My map has two candy canes. I opened the one on the left, got the usual message, but the clowns spawned under the other candy cane for some reason. Most of them then proceeded to wander the circus aimlessly rather than heading up into the trap I had prepared for them. There was a perfectly open (albeit long) path available to them, and my miner followed it no problem.

Reloaded previous save.
This time I opened the cane on the right they and appeared again, still under the cane on the right. So far so good. My miner heads off to get a drink, again using the prepared path. The clowns follow briefly, but stop after about 30 steps. After awhile of waiting for them to move I notice there is less of them than there used to be. They've gone back down the cane. Then the strangest part, they're in the magma sea. The only open holes to the magma sea are under my magma forges, with the non-walkable tiles covering the holes. At no point do the spires open into the sea, so they could only have gotten in by teleporting through a wall. They aren't even trying to get in through the forges, they're just scattering in all directions, including up/down.

My brilliant trap would appear to be worthless as it relies on the clowns actually wanting to get into my fort and tear it apart, and the teleporting means I can't even send the military after them.

Can anyone enlighten me as to what the hell is happening here?

[utunnels]

They path into magma sea every time I closed my draw bridge.

I guess that is because flying creatures can path vertically diagonally.

[PatrikLundell]

Up/Down staircases (and presumably down only as well) "leak" diagonally downwards, i.e. a creature one tile below to the side (both directly above/to the side and NW, NE, SW, SE) can path into such staircases. Thus, if you leave the staircases built when dealing with magma flows in place there is a path into (and out of) the sea on the magma side below the staircase (unless the magma flow was perfectly flat, in which case there are no tiles available below). I think that removing the staircase will still leave a hole if the staircase is removed after obsidianization of the magma flow tile, because the tile below becomes roofless (only explanation I have to why I got invaded by fire imps), so these tiles need to be tiled over with a floor or wall to plug the security breach (I assume an up only staircase will do as well).

The above is one possible explanation, but it might not be the only one.

[§k]

Fliers always have problem pathing to a place they can't directly see.

Semi-molten rock seems really semi-molten -- they're not solid! When I pour water down to magma sea, the obsidian sinks into the red layer and disappears.

[utunnels]

Everything doesn't get explained above can be explained by saying it is a bug supernatural, after all they are... the word D.

[Pirate Santa]

Everything doesn't get explained above can be explained by saying it is a bug supernatural, after all they are... the word D.

Delicious?

[PatrikLundell]

Delirious, I think...

Semi molten rock seems to obliterate anything that falls on top of it (at least when falling through magma; I haven't experimented with any falls through air), but there is a method (described on the wiki) to obsidianize the magma flow layer that always lies on top of it (if SMR isn't in direct contact with rock already). Also, SMR can be dug through from below under certain constraints, but that is not very useful in itself, though.