Description of problem:
GetObjectAttributes request with ObjectParts attribute is failing with invalid xml

[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ aws --endpoint-url http://10.0.66.18:80 s3api get-object-attributes --bucket bkt1 --key multipart-obj --object-attributes  "ObjectParts"

Unable to parse response (reference to invalid character number: line 1, column 138), invalid XML received. Further retries may succeed:
b'<?xml version="1.0" encoding="UTF-8"?><GetObjectAttributes><ObjectParts><Part><PartNumber>1</PartNumber><Size>7000000</Size><ChecksumNONE>&#x00;&#x00;&#x00;&#x00;</ChecksumNONE></Part><Part><PartNumber>2</PartNumber><Size>6500000</Size><ChecksumNONE>&#x00;&#x00;&#x00;&#x00;</ChecksumNONE></Part><Part><PartNumber>3</PartNumber><Size>6000000</Size><ChecksumNONE>&#x00;&#x00;&#x00;&#x00;</ChecksumNONE></Part><PartsCount>3</PartsCount><TotalPartsCount>3</TotalPartsCount><IsTruncated>false</IsTruncated><MaxParts>22100</MaxParts><NextPartNumberMarker>3</NextPartNumberMarker><PartNumberMarker>0</PartNumberMarker></ObjectParts></GetObjectAttributes>'
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ 



Version-Release number of selected component (if applicable):
ceph version 19.1.1-21.el9cp

How reproducible:
always

Steps to Reproduce:
1.deploy rhcs8.0 with rgw daemons
2.create a bucket
3.create multipart upload
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ aws --endpoint-url http://10.0.66.18:80 s3api create-multipart-upload --bucket bkt1 --key multipart-obj
{
    "Bucket": "bkt1",
    "Key": "multipart-obj",
    "UploadId": "2~C1P9UBt1xoAROxtQlgiqjTCp4febxxs"
}
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$

4.upload parts
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ aws --endpoint-url http://10.0.66.18:80 s3api upload-part --bucket bkt1 --key multipart-obj --upload-id 2~C1P9UBt1xoAROxtQlgiqjTCp4febxxs --part-number 1 --body part1
{
    "ETag": "\"8e5daee75e9a4bb3d912168d5c14f960\""
}
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ 
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ aws --endpoint-url http://10.0.66.18:80 s3api upload-part --bucket bkt1 --key multipart-obj --upload-id 2~C1P9UBt1xoAROxtQlgiqjTCp4febxxs --part-number 2 --body part2
{
    "ETag": "\"dcc4fd782a40c1ba4366c0d017ad63e5\""
}
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ 
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ aws --endpoint-url http://10.0.66.18:80 s3api upload-part --bucket bkt1 --key multipart-obj --upload-id 2~C1P9UBt1xoAROxtQlgiqjTCp4febxxs --part-number 3 --body part3
{
    "ETag": "\"75c6f06ec40f8063da34fcd7fc2bf17f\""
}
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ 

5.complete multipart upload
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ cat parts.json 
{
  "Parts": [
    {
      "ETag": "\"8e5daee75e9a4bb3d912168d5c14f960\"",
      "PartNumber": 1
    },
    {
      "ETag": "\"dcc4fd782a40c1ba4366c0d017ad63e5\"",
      "PartNumber": 2
    },
    {
      "ETag": "\"75c6f06ec40f8063da34fcd7fc2bf17f\"",
      "PartNumber": 3
    }
  ]
}
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ 
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ aws --endpoint-url http://10.0.66.18:80 s3api complete-multipart-upload --bucket bkt1 --key multipart-obj --upload-id 2~C1P9UBt1xoAROxtQlgiqjTCp4febxxs --multipart-upload file://parts.json
{
    "Location": "http://10.0.66.18/bkt1/multipart-obj",
    "Bucket": "bkt1",
    "Key": "multipart-obj",
    "ETag": "\"1c7cfdc53825e01d7040127b7d2f3e51-3\""
}
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$

6.get object attributes with ObjectParts as object-attribute. its failing with invalid xml
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ aws --endpoint-url http://10.0.66.18:80 s3api get-object-attributes --bucket bkt1 --key multipart-obj --object-attributes  "ObjectParts"

Unable to parse response (reference to invalid character number: line 1, column 138), invalid XML received. Further retries may succeed:
b'<?xml version="1.0" encoding="UTF-8"?><GetObjectAttributes><ObjectParts><Part><PartNumber>1</PartNumber><Size>7000000</Size><ChecksumNONE>&#x00;&#x00;&#x00;&#x00;</ChecksumNONE></Part><Part><PartNumber>2</PartNumber><Size>6500000</Size><ChecksumNONE>&#x00;&#x00;&#x00;&#x00;</ChecksumNONE></Part><Part><PartNumber>3</PartNumber><Size>6000000</Size><ChecksumNONE>&#x00;&#x00;&#x00;&#x00;</ChecksumNONE></Part><PartsCount>3</PartsCount><TotalPartsCount>3</TotalPartsCount><IsTruncated>false</IsTruncated><MaxParts>22100</MaxParts><NextPartNumberMarker>3</NextPartNumberMarker><PartNumberMarker>0</PartNumberMarker></ObjectParts></GetObjectAttributes>'
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ 

7.but with other object attributes, the request is successful
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ aws --endpoint-url http://10.0.66.18:80 s3api get-object-attributes --bucket bkt1 --key multipart-obj --object-attributes "StorageClass" "ETag" "ObjectSize" "Checksum"
{
    "LastModified": "Wed, 11 Sep 2024 14:33:00 GMT",
    "ETag": "1c7cfdc53825e01d7040127b7d2f3e51-3",
    "Checksum": {},
    "StorageClass": "STANDARD",
    "ObjectSize": 19500000
}
[cephuser@ceph-hsm-reef-pqd722-node6 ~]$ 


Actual results:
GetObjectAttributes request with ObjectParts attribute is failing with invalid xml.

Expected results:
expected GetObjectAttributes request with ObjectParts attribute is successful.

Additional info: