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The second options checks if the resulting shape is valid.In case it is invalid the boolean Feature is makerd with an exclamation mark.
Regards, Petar I took shoogens freecad model version (chopped it) and converted to mesh and back to solid using tolerance of .01 both ways. I'm not talking about cylindrical faces, but about planar ones.Take a look at selected faces on my picture in the post - they might not be on the same plane, but It looks to me like they are.Otherwise the broken shape would silently propagate through the feature tree.This is useful to find problems with coincident geometry and because invalid shapes can crash Free CAD in refine as well as in a consecutive boolean. And you need to disable this to retrive a invalid result.