Grouped objects lose alignment when rotated

See attached file: I have a set of 7 objects (6 boxes on a ‘plank’) which are carefully aligned and grouped. I need to rotate the group and maintain the alignments. However, when I do the rotation the boxes become unaligned from the plank although they seem to maintain alignment to each other. Rotating the group back to zero restores the correct alignment.

How can I maintain the alignments when rotating?

20220330 Rotate Test.rp (70.4 KB)