Operating system: windows 10 pro
Graphics card:and rx580
Broken:2.79b to 2.80.0 git925380050d0 windows 64
(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Short description of error
After sculpting my model in 2.79, I opened it on 2.8 and some weird lines appeared. The only modifier used is multires 8 subdivisions.
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).