I found that the Umbraco 7.15 version and the 7.13 version of this interface

/umbraco/backoffice/UmbracoApi/Entity/GetByIds?type=Media

return a different JSON structure

7.13 version as follows：

[{
"name": "test",
"id": 1054,
"udi": "umb://media/c0d41bef634045bfa26349b48df5cfe6",
"icon": "icon-picture",
"trashed": false,
"key": "c0d41bef-6340-45bf-a263-49b48df5cfe6",
"parentId": -1,
"alias": null,
"path": "-1,1054",
"metaData": {
    "NodeObjectTypeId": "b796f64c-1f99-4ffb-b886-4bf4bc011a9c",
    "HasChildren": false,
    "ContentTypeAlias": "Image",
    "ContentTypeIcon": "icon-picture",
    "ContentTypeThumbnail": "icon-picture",
    "IsPublished": false,
    "IsDraft": false,
    "HasPendingChanges": false,
    "NodeUser": 0,
    "UniqueID": "c0d41bef-6340-45bf-a263-49b48df5cfe6",
    "Text": "test",
    "NodeObjectType": "b796f64c-1f99-4ffb-b886-4bf4bc011a9c",
    "Children": 0,
    "Alias": "Image",
    "Icon": "icon-picture",
    "Thumbnail": "icon-picture",
    "IsContainer": false,
    "ContentNodeId": 1054,
    "VersionId": "df476468-2ed1-45e3-b714-6ea6b1e62036",
    "umbracoFile": {
        "PropertyEditorAlias": "Umbraco.ImageCropper",
        "Value": {
            "src": "/PR1001/media/1001/test.png",
            "crops": []
        }
    },
    "umbracoWidth": {
        "PropertyEditorAlias": "Umbraco.NoEdit",
        "Value": "383"
    },
    "umbracoHeight": {
        "PropertyEditorAlias": "Umbraco.NoEdit",
        "Value": "495"
    },
    "umbracoBytes": {
        "PropertyEditorAlias": "Umbraco.NoEdit",
        "Value": "63934"
    },
    "umbracoExtension": {
        "PropertyEditorAlias": "Umbraco.NoEdit",
        "Value": "png"
    }
}]

however, 7.15 version as follows:

[{
"name": "test",
"id": 1054,
"udi": "umb://media/d9017c0c09a34ce59839d077b7c4c28f",
"icon": "icon-picture",
"trashed": false,
"key": "d9017c0c-09a3-4ce5-9839-d077b7c4c28f",
"parentId": -1,
"alias": null,
"path": "-1,1054",
"metaData": {
    "NodeObjectTypeId": "b796f64c-1f99-4ffb-b886-4bf4bc011a9c",
    "HasChildren": false,
    "ContentTypeAlias": "Image",
    "ContentTypeIcon": "icon-picture",
    "ContentTypeThumbnail": "icon-picture",
    "IsPublished": false,
    "IsDraft": false,
    "HasPendingChanges": false,
    "NodeUser": 0,
    "UniqueID": "d9017c0c-09a3-4ce5-9839-d077b7c4c28f",
    "Text": "test",
    "NodeObjectType": "b796f64c-1f99-4ffb-b886-4bf4bc011a9c",
    "Children": 0,
    "Alias": "Image",
    "Icon": "icon-picture",
    "Thumbnail": "icon-picture",
    "IsContainer": false,
    "MediaPath": "/media/1001/test.png"
}}]

Why there is such a difference, this works fine for using the local file system, but when using S3, the picture URL does not contain a bucket prefix, which causes the interface

umbraco/backoffice/UmbracoApi/Images/GetBigThumbnail?originalImagePath=%2Fmedia%2F6860%2Ftest.png

/media/6860/test.png (error)

/PR1001/media/6860/test.png (right)

to get the picture without a bucket prefix parameter,

This will cause the picture to not be displayed, is it due to the upgrade of Umbraco 7.15?

thanks.