MacOS Proxy exceptions list does not work for external IPs

Hi everyone. I'm working on a Proxy product for traffic filtering, among the functionalities of which is the ability to bypass requests by IP addresses and Domains, in order to exclude contact of "unnecessary" requests with proxies. Regarding exclusion of requests based on their domains, I use an awesome proxy exclusion list that can be set in the proxy settings for a specific network interface. But also, MacOS offers IP address exclusion by default (as you can see in the screenshot: 169.254/16), but unfortunately this functionality doesn't work for external IP addresses of any resources. Requests regardless of IP address exclusion - go through the specified proxy. Could you tell me what limitations the exclusion list has, perhaps it requires specific formats for IP addresses, or works only for local addresses of a certain network, or MacOS may provide some other solutions in this regard?

MacOS Proxy exceptions list does not work for external IPs
 
 
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