You cannot build on this type of terrain and the ground is..

[Roirraw]

So i wanted to build a trellis there but I got a warning that I can't build on this type of terrain, so i stomped to the ground this one tile of basalt and tried to did a trellis again, got a warning that the ground is not flat enough, seems weird.

Also when u are sitting on a chair and u want to travel to your hearth fire, the chair is rotating with you to the direction of your hearth fire.

[jorb]

Some part of the trellis' bounding box is probably over the slope there, quite simply.

Also feel free to make distinct threads for distinct bug reports.