This bug and its duplicates seem to have happened during distribution upgrades:
10:24:37 - flash:[...ents/canonical/launchpadlib] ./bug-check-duplicate-properties.py --bug 930004 --keys UpgradeStatus
LP: #930004 has a total of 6 duplicates
UpgradeStatus
[1] Upgraded to precise on 2012-02-12 (0 days ago): 931064
[1] Upgraded to precise on 2012-02-11 (0 days ago): 930498
[3] Upgraded to precise on 2012-02-10 (0 days ago): 930243, 930257, 930417
[1] Upgraded to precise on 2012-02-13 (0 days ago): 931537
This bug and its duplicates seem to have happened during distribution upgrades:
10:24:37 - flash:[ ...ents/ canonical/ launchpadlib] ./bug-check- duplicate- properties. py --bug 930004 --keys UpgradeStatus
LP: #930004 has a total of 6 duplicates
UpgradeStatus
[1] Upgraded to precise on 2012-02-12 (0 days ago): 931064
[1] Upgraded to precise on 2012-02-11 (0 days ago): 930498
[3] Upgraded to precise on 2012-02-10 (0 days ago): 930243, 930257, 930417
[1] Upgraded to precise on 2012-02-13 (0 days ago): 931537