This is the public portal for all IBM Z Hardware and Operating System related offerings. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (https://ideas.ibm.com).
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Welcome to the IBM Ideas Portal (https://www.ibm.com/ideas) - Use this site to find out additional information and details about the IBM Ideas process and statuses.
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Have you opened a case with IBM? Perhaps, I am missing something or just don't have enough information, but it appears the failure to RESTORE existing target datasets can be overcome with the use of the REPLACE parameter.
z/OS DFSMSdss Storage Administration
"To use a preallocated data set, you must specify the REPLACE or
REPLACEUNCONDITIONAL keyword. If the REPLACE keyword is specified, the
preallocated target data set name must be identical to the source data set name."