HI Michael,

found one bug with bezier, or at least a weird behaviour,

as you can see in the attached screenshot and file, the left is the expected result (I tweaked the right object to get it) and on the right is the orginal output of the bezier function, it was created out of the for outlining curves, which has a dent in the middle. To reproduce you just deleted the faces of the right object, select all 4 curves and bezier,
regards,

Thor