Operating system: Windows 7
Graphics card: GT750M
Broken: 2.80, 2019-02-28
Short description of error
When applying a "Solidify" modifier to a bezier curve shape (or imported SVG), it creates random height vector points, creating strange triangles. This can be fixed by simply selecting the errored vector point then selecting one of the transform value (in my case it was Y) in the panel and either pushing enter (keeping the same value) or unselecting the vector point.
Exact steps for others to reproduce the error
Attached blend file with imported SVG.