Operating system: Ubuntu 18.04.2
Graphics card: GT 1030
Broken: Blender 2.8
Worked: I didn't have that problem in 2.79
Short description of error
When you export ply format from Blender it exports with triangulation. I didn't have that problem in 2.79.
Exact steps for others to reproduce the error
Create Suzane in blender and export it as ply with everything unchecked in export panel. And after that import again in ply format.