Any update for KB000167255?

I got the issue mentioned in https://www.dell.com/support/kbdoc/en-us/000167255/unisphere-for-vmax-8-4-0-15-rest-api-cascaded-storage-group-operation-creates-an-addtional-child-storage-group-with-parent-sg-name-that-was-not-called?lang=en

I am running on PowerMax REST API 9.1 but still have the same error, may I know if there is any update for this issue?