Edited Unassigned: [4.0 RC1] Using indexer against Cells property did not return all expected cells [15100]

In some excel document I invoked Cells["B105:G105"]. The expected result is the following enumeration of cells:
* B105
* C105
* D105
* E105
* F105
* G105

But the actual result did not contain E105 cell. See screenshot: