Cutting a sphere by a box fails in one direction

**Test code**

```python
import cadquery as cq

show_object(
cq.Workplane().sphere(1).cut(
cq.Workplane().box(2, 2, 0.5)
).translate((0,0,2))
)
show_object(
cq.Workplane().sphere(1).cut(
cq.Workplane().box(0.5, 2, 2)
)
)
```

**Result:**
The top cut is ok, the bottom cut is broken


**Environment:**

CadQuery:
```bash
Successfully installed cadquery-2.2.dev531+g03c3266
```