If you work a lot with Add/Subtract Solids in VW
(Because the come in fine into C4D and even repair Extrudes incorrect Face Orientation),
don't make the mistake to edit these too much in VW
or you may get problems in C4D later.
If you think, like me,
you could simply add further subtracting Geometry into a Solid Subtraction or do larger changes,
the result in VW may look as expected,
(even in a RW rendering as far as I remember)
but after an C4D Export, only half of the changes may come in !
To avoid this,
always "CMD+X" + Exit Solid Subtraction + "CMD+SHIFT*V" all Geometry and do the Solid Operation
again !