System Information
Operating system: windows 10
Graphics card:MSI gtx1050ti

Blender Version
Broken: Blender 2.80 Release Candidate 3
Worked: (optional)

Hello. When working with tools such as Line, Arc, Curve, Box, Circle, sometimes the circle that disappears for the size of the change will reappear!

And also when working with the Draw Tool, sometimes, when changing the Radius size in WorkSpace, the marker does not draw the shape of the deformation mouse.

Just use this tools for a short time. Then you will find the problems. For example, during the work, change the Radius size of the Draw tool or use the Curve tool several times