System Information
Operating system: Windows 10
Graphics card: -

Blender Version
2.81

Short description of error
Boolean Modifier not working correctly

Exact steps for others to reproduce the error
Default startup scene with cube

1. create a UV sphere with 128 Segments and 64 rings
2. move the sphere 1 unit into x and 1 unit into y directions (the bug doesn't appear if the sphere is only move 1 into x)
3. select the cube and put a boolean modifier onto it with the sphere as "object" and "intersect" as operation.

Result: the cube disappears. It is reduced to 3 points instead of the intersection.