Object data missing, but metadata is OK (Quincy 17.2.3)

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We have a large cluster on Quincy 17.2.3 with a bucket holding 8.9 million small (15~20 MiB) objects.  
All the objects were multipart uploads from scripts using `aws s3 cp` 
The data is static (write-once, read-many) with no manual deletions and no new writes for months.
We recently found 3 objects in this bucket that cannot be retrieved.
The symptom is exactly the same as https://tracker.ceph.com/issues/47866 and https://bugzilla.redhat.com/show_bug.cgi?id=1892644 which were fixed a long time ago.
Any form of listing (`aws s3 ls`, radosgw-admin object stat, radoslist, http head request, etc)  returns good data, but the objects cannot be retrieved and rados -p ls shows the object data is missing.
Any suggestions on how to troubleshoot this further?
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