Bug with fillet causing solid to disappear

[combolek]

The following code causes the solid body to disappear and it leaves some surfaces only:

import cadquery as cq

result = (
    cq.Workplane('YZ')
    .cylinder(75, 40)
    .faces('>X')
    .workplane()
    .transformed(rotate=(-45,0,0))
    .split(keepBottom=True)
)

result = result.edges('|Y').fillet(4)

Note that increasing the fillet value to 5 seems to work OK: