RGW versioned objects lost after Octopus 15.2.3 -> 15.2.4 upgrade

[Chris Palmer <chris@xxxxxxxxxxxxxxxxxxxxx>]

I have an RGW bucket (backups) that is versioned. A nightly job creates 
a new version of a few objects. There is a lifecycle policy (see below) 
that keeps 18 days of versions. This has been working perfectly and has 
not been changed. Until I upgraded Octopus...

The nightly job creates separate log files, including a listing of the 
object versions. From these I can see that:

13/7  02:14   versions from 13/7 01:13 back to 24/6 01:17 (correct)

14/7  02:14   versions from 14/7 01:13 back to 25/6 01:14 (correct)

14/7  10:00   upgrade Octopus 15.2.3 -> 15.2.4

15/7  02:14   versions from 15/7 01:13 back to 25/6 01:14 (would have 
expected 25/6 to have expired)

16/7  02:14   versions from 16/7 01:13 back to 15/7 01:13 (now all 
pre-upgrade versions have wrongly disappeared)

It's not a big deal for me as they are only backups, providing it 
continues to work correctly from now on. However it may affect some 
other people  much more.

Any ideas on the root cause? And if it is likely to be stable again now?

Thanks, Chris

{
    "Rules": [
        {
            "Expiration": {
                "ExpiredObjectDeleteMarker": true
            },
            "ID": "Expiration & incomplete uploads",
            "Prefix": "",
            "Status": "Enabled",
            "NoncurrentVersionExpiration": {
                "NoncurrentDays": 18
            },
            "AbortIncompleteMultipartUpload": {
                "DaysAfterInitiation": 1
            }
        }
    ]
}

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