I’m trying to understand Baseline status of a feature - ruby-position

It became Newly available in December 2024 with Safari update. In writing blog post for it, realized one of the keyword inter-character does not render as expected (you can see the expected behavior and current rendering here), and BCD also suggests this feature is incomplete.

Was there a reason / pervious discussion as to why this feature is marked Baseline Newly available on web-features?

Expected behavior: https://www.w3.org/International/articles/ruby/styling.en.html#bopomofo_position
BCD table on MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/ruby-position#browser_compatibility

Related bugs
Chrome Bug: https://issues.chromium.org/issues/40174517
FireFox Butg https://bugzilla.mozilla.org/show_bug.cgi?id=1055672
Safari Bug: https://bugs.webkit.org/show_bug.cgi?id=285694