Google Cloud have requested that the "Directory Name" field that issuers complete in their Spotlight Directory settings on ACMS, reflect accordingly on the live Directory. This requires the current "Credential Holder Directory" name to be replaced with the names issuers have entered for their Directories.
It has been noted that this would be possible as we have this data for customers and that we'd just have to give customers a heads-up of a few weeks to allow them to update their Directory names if necessary.
From what I can gather, based on published US Directories - this name replication may have been the assumption from customers from the get-go, as most of the Directories seem to be named accordingly (i.e. "Customer Name Directory").