I can see no bug here - Pi-holes Interface settings work as advertised.
Note that IPV4_ADDRESS and IPV6_ADDRESS have been deprecated after Pi-hole FTL v5.8, Web v5.5 and Core v5.3 released in April 2021, when the Automated IP blocking mode was introduced, together with a changed Interface settings UI.
You should have a read of Pi-hole's documentation on its Interface binding behaviour as linked from that UI. It explains in detail which dnsmasq options correlate with ticking one of the UI radio buttons.
As your goal seems to be to restrict Pi-hole to bind and listen to only specific IP addresses, and Pi-hole does not currently expose such a setting via its UI, you should probably rephrase and recategorise your topic as a feature request.