Operating system: Ubuntu 18.04
Graphics card: Intel Onboard
Broken: 2.80, 66c23ea2b4a4, 2019-02-09 20:41
Worked: Blender 2.79
MeshDeform Modifier does not work on a solidified planar mesh
Exact steps for others to reproduce the error
Load meshdeform_bug.blend into Blender. (File attached).
There is a collection with name "SolidifyBug". It contains a plane and a donut.
If you deform the plane, there is no deformation on the donut.
If you apply solidify to the plane, and re-bind the donut's meshdeform modifier, everything works fine.