you can't build wood, stone floor/ blue,green,red rug on North-West/West/North tile of an existing floor
you can still build Rugs around wood, stone floor though, and vise versa,
but new banned zone will appear as well..
you can't build painting/ wall torch/wall light on the banned zone created by Rug floor
Metal floor, farm plot, stone path seems fine, no such problem (the floors in dev section are fine)
wall banner, wood shelf show red background when you tried to build them on any wall/window/door, but you can still build them
weapon workbench, car station can not be flipped, when you try to flip them, the preview image show them flipped.
but when you actually built them, it doesn't get flipped.
(weapon workbench does have image_xscale set to -1.000000 though but car station doesn't)
and the preview image of flipped car station is kinda off...
also, the weapon spawn zone may get blocked by obstacles,
unlike the car station, it doesn't show red background when the spawn point blocked by something
photocell, volt meter, switch, small battery and the farming, lumberjack, ranching robot don't have collision box
after you built the flipped robots, the starting position of the robots are kinda off
the image of flipped solar panel is kinda off, doesn't match the collision box