s3api ListObjects no NextMarker in result when no Delimiter

[chenmingjian]

here(https://docs.openstack.org/swift/2023.2/s3_compat.html) I find swift s3 restful api is compatible with s3 ListObjects protocol.

but in s3 page(https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListObjects.html#AmazonS3-ListObjects-response-NextMarker) I find:
NextMarker:
    When the response is truncated (the IsTruncated element value in the response is true), you can use the key name in this field as the marker parameter in the subsequent request to get the next set of objects. Amazon S3 lists objects in alphabetical order.

but no NextMarker in s3api ListObjects results when there is no Delimiter.

Two different performances make s3api loose.