Operating system: Windows 10
Graphics card: GTX1080Ti
Broken: 2.8 latest master
Worked: Probably never
Short description of error
Simple Deform modifier in Bend mode doesn't work on thin geometry, such as plane. It's a very common workflow to bend a simple rectangular plane.
Exact steps for others to reproduce the error
1, In a new blender file, create a plane
2, Enter edit mode of the plane, and subdivide the plane a few times to get enough topological density for bending
3, Exit edit mode and apply Simple Deform modifier on the plane
4, Switch Simple Deform mode to Bend
5, Notice that despite Deform angle being set to 45°, the modifier has no effect on X axis
6, Switch to Y axis and notice the modifier has also no effect
7, Switch to Z axis and notice the modifier has effect, although Z axis is the least likely axis user will want to bend a plane along.
Result: Simple Deform modifier set to Bend mode works only on Z axis if the geometry is thin (planar)
Expected: Simple Deform modifier in Bend mode works on any kind of geometry.