The customer installed the APAR LU06535.
Before the installation of such APAR, the assignment of a RACF group to a user set the connect-owner parameter to the value of the group being assigned.
After the installation, the connect-owner was always set to UCAIDM, which is the technical user defined in the CA LDAP configuration:
Release : 14.4
New fix provided for the customer: LU08974.
Please reach out to support for this hotfix.