Please check if you have any pending changes or just do a cmk -R on the commandline and check if the output of cmk -D still looks the same. It looks like the rule for the special agent does not see that the host has a specific IP-address configured.
I just created a rule in my test-site and it picks up the IP-address as expected. You could also just delete the rule you already have and create a new one, maybe then the IP-address is being set correctly in the agent-call.
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