Steps to reproduce:
- Open Matrix/03_Design Structure Matrix(DSM);
- There are 4 up-level items in a grid - assert their indexes. They will be: 0, 4, 6, 8 (but should be 0,1,2,3);
- Expand each item and collapse. Assert their indexes again. They will be: 0,4,11,19 (as if they are not collapsed).