Missunderstanding about "multiple answers" attack strategy

Hi! I have been using Singularity of Origin for some time and I was wondering whether you can help me answer some technical questions I did not succeed in solving so far.

I have been using the "Multiple answers" attack strategy multiple times and as indicated in the Wiki, one should set the "Target host" field to 0.0.0.0 on Unix and MacOS systems and to 127.0.0.1 on Windows systems. Is there a reason for this? I know that 0.0.0.0 "allows us to access the localhost on Linux and macOS systems" but why isn't 127.0.0.1 used on all systems?

Also, I am running these versions of Chrome (136.0.7103.59 ), Chromium (135.0.7049.95) and Firefox (137.0.2) on a machine with a Debian distribution and it seems like PNA is not enforced in any of these browsers when using 127.0.0.1 as the "Target host" and "First then second" rebinding strategy. This is different compared to what was reported before. Do you know whether there is a reason for this?

No source file or test is identified. Start by reviewing the Wiki guidance for the Multiple answers strategy and the reported behavior with 0.0.0.0, 127.0.0.1, and PNA in the listed Chrome, Chromium, and Firefox versions. Done means the platform-specific behavior and the apparent PNA discrepancy are explained or reproduced.