SnappyHexMesh writeFlags error - addedCells not written

from 1612+ when running SHM with:

// Write flags
writeFlags
(
    layerSets
);

Snappy will write to the Info stream:

Writing 5328 added cells to cellSet addedCells

Writing 2668 faces inside added layer to faceSet layerFaces

This is from iglooWithFridges tutorial, but the sets are actually never written. The same story for motorBike.