The DeleteFamily cell is skipped when StoreScanner seeks to next column

The qualifier of a deleted row (with keep deleted cells true) re-appears after re-inserting the same row multiple times (with different timestamp) with an empty qualifier.

Scenario:

1. Put row with family and qualifier (timestamp 1).
2. Delete entire row (timestamp 2).
3. Put same row again with family without qualifier (timestamp 3).
   A scan (latest version) returns the row with family without qualifier, version 3 (which is correct).
4. Put the same row again with family without qualifier (timestamp 4).
   A scan (latest version) returns multiple rows:

• the row with family without qualifier, version 4 (which is correct).
• the row with family with qualifier, version 1 (which is wrong).

There is a test scenario attached.
output:
<LOG> 13:42:53,952 [main] client.HBaseAdmin - Started disable of test_dml
<LOG> 13:42:55,801 [main] client.HBaseAdmin - Disabled test_dml
<LOG> 13:42:57,256 [main] client.HBaseAdmin - Deleted test_dml
<LOG> 13:42:58,592 [main] client.HBaseAdmin - Created test_dml
Put row: 'myRow' with family: 'myFamily' with qualifier: 'myQualifier' with timestamp: '1'
Scan printout =>
Row: 'myRow', Timestamp: '1', Family: 'myFamily', Qualifier: 'myQualifier', Value: 'myValue'
Delete row: 'myRow'
Scan printout =>
Put row: 'myRow' with family: 'myFamily' with qualifier: 'null' with timestamp: '3'
Scan printout =>
Row: 'myRow', Timestamp: '3', Family: 'myFamily', Qualifier: '', Value: 'myValue'
Put row: 'myRow' with family: 'myFamily' with qualifier: 'null' with timestamp: '4'
Scan printout =>
Row: 'myRow', Timestamp: '4', Family: 'myFamily', Qualifier: '', Value: 'myValue'
Row: 'myRow', Timestamp: '1', Family: 'myFamily', Qualifier: 'myQualifier', Value: 'myValue'