Device does not send DHCP Decline message when an address conflict is detected (certification issue)

Regarding attribtue of the TCP/iP Interface object, the CIP specification says (Volume 2 Edition 1.23 section 5-4.3.2.3.2  "Configuration Method"):

"If the Configuration Method is 2, the device shall obtain its IP configuration via DHCP. The
DHCP client behavior shall be as defined in the relevant RFCs (RFC 2131, RFC 2132) or
their successors."

RFC 2131 states:
"If the client detects that the address is already in use (e.g., through the use of ARP), the client MUST send a DHCPDECLINE message to the server and restarts the configuration process." [RFC2131]

Note:
This missbehavior counts as a warning during the CT14 conformance testing (so still is a PASS), but maybe it becomes an error for CT15.