diff --git a/.config/e2e-full-selection.txt b/.config/e2e-full-selection.txt
index eb0c8f9db..e09c9add1 100644
--- a/.config/e2e-full-selection.txt
+++ b/.config/e2e-full-selection.txt
@@ -1,2 +1,2 @@
-sha256-darwin=9e9687ded961aa4e619a15def6e1ee0a5153be05423d009ee7a58126624c83e7
-sha256-linux=364666693c2bf258997643c9d87e07e7b7501e58175f190d201d53c81946eb20
+sha256-darwin=a6aee967387226b6e6937a0e625db53048c8b2f502636820a09c6ad791341b44
+sha256-linux=6b8b8f3dbdd63414fc969716ae3d7c2ec71712395630bae8bd419de2f32195b3
diff --git a/crates/ecstore/src/core/pools_test.rs b/crates/ecstore/src/core/pools_test.rs
index 296f253e2..3b4e10059 100644
--- a/crates/ecstore/src/core/pools_test.rs
+++ b/crates/ecstore/src/core/pools_test.rs
@@ -2321,6 +2321,18 @@ mod decommission_lock_order_tests {
             .expect("the multipart target must publish before capacity progress save");
         assert!(published.is_multipart(), "published target must retain multipart identity");
         assert_eq!(published.version_id.map(|version| version.to_string()), Some(source_version.clone()));
+        for prefix in [
+            rustfs_utils::http::RUSTFS_INTERNAL_PREFIX,
+            rustfs_utils::http::MINIO_INTERNAL_PREFIX,
+        ] {
+            assert_eq!(
+                published
+                    .user_defined
+                    .get(&format!("{prefix}{}", rustfs_utils::http::SUFFIX_MULTIPART_UPLOAD_ID)),
+                Some(&source_upload.upload_id),
+                "migration must preserve the source completion identity under both internal prefixes"
+            );
+        }
         let mut published_reader = lossy_store.pools[2]
             .get_object_reader(
                 &bucket,
diff --git a/crates/ecstore/src/set_disk/ops/multipart.rs b/crates/ecstore/src/set_disk/ops/multipart.rs
index 1d3a4ee50..f41bdf20b 100644
--- a/crates/ecstore/src/set_disk/ops/multipart.rs
+++ b/crates/ecstore/src/set_disk/ops/multipart.rs
@@ -3108,7 +3108,9 @@ impl crate::storage_api_contracts::multipart::MultipartOperations for SetDisks {
         // on the object is what lets a retried CompleteMultipartUpload return this
         // version instead of NoSuchUpload. insert_str writes both internal prefixes;
         // a later conflicting pair fails closed in the replay matcher.
-        if !upload_id.is_empty() {
+        // Internal migration must preserve the source completion identity rather
+        // than replace it (or invent one) with the temporary transfer upload id.
+        if !opts.data_movement && !upload_id.is_empty() {
             insert_str(&mut fi.metadata, rustfs_utils::http::SUFFIX_MULTIPART_UPLOAD_ID, upload_id.to_owned());
         }
 
@@ -5115,6 +5117,10 @@ mod tests {
             )
             .await
             .expect("completed data movement object should be readable");
+        assert!(
+            !rustfs_utils::http::contains_key_str(&completed.user_defined, rustfs_utils::http::SUFFIX_MULTIPART_UPLOAD_ID),
+            "migration of a source without a completion identity must not invent one"
+        );
         assert!(!rustfs_utils::http::contains_key_str(
             &completed.user_defined,
             rustfs_utils::http::SUFFIX_DATA_MOVEMENT_UPLOAD
@@ -8822,10 +8828,9 @@ mod tests {
             ..Default::default()
         }];
 
-        assert_eq!(
+        assert!(
             completed_multipart_upload_matches(&metadata, &parts, false, upload_id, &requested, "bucket", "object")
-                .expect("quoted ETag must match the stored part"),
-            true
+                .expect("quoted ETag must match the stored part")
         );
         let wrong_etag = vec![CompletePart {
             part_num: 1,
@@ -8836,15 +8841,13 @@ mod tests {
             completed_multipart_upload_matches(&metadata, &parts, false, upload_id, &wrong_etag, "bucket", "object"),
             Err(StorageError::InvalidPart(1, _, _))
         ));
-        assert_eq!(
-            completed_multipart_upload_matches(&metadata, &parts, false, "other-upload", &requested, "bucket", "object")
-                .expect("a different upload id is not this completion"),
-            false
+        assert!(
+            !completed_multipart_upload_matches(&metadata, &parts, false, "other-upload", &requested, "bucket", "object")
+                .expect("a different upload id is not this completion")
         );
-        assert_eq!(
-            completed_multipart_upload_matches(&metadata, &parts, true, upload_id, &requested, "bucket", "object")
-                .expect("a delete marker is not the completed object"),
-            false
+        assert!(
+            !completed_multipart_upload_matches(&metadata, &parts, true, upload_id, &requested, "bucket", "object")
+                .expect("a delete marker is not the completed object")
         );
 
         metadata.insert(
diff --git a/rustfs/src/app/multipart_usecase.rs b/rustfs/src/app/multipart_usecase.rs
index a6754bfe5..e92a3be6e 100644
--- a/rustfs/src/app/multipart_usecase.rs
+++ b/rustfs/src/app/multipart_usecase.rs
@@ -891,8 +891,8 @@ impl DefaultMultipartUsecase {
             key: Some(key.clone()),
             e_tag: obj_info.etag.clone().map(|etag| to_s3s_etag(&etag)),
             location: Some(location),
-            server_side_encryption: server_side_encryption.clone(),
-            ssekms_key_id: ssekms_key_id.clone(),
+            server_side_encryption,
+            ssekms_key_id,
             checksum_crc32,
             checksum_crc32c,
             checksum_sha1,