Expected: The expanded list should include CJK Unified Ideographs Extension J xxxx/yyyy, as the BSH Extra has supported a few thousand Extension J characters, such as U+323B0.
Actual: The expanded list only include CJK Unified Ideographs from B to I, which are defined prior to Unicode 17.0. That’s why I suspect the Unicode definition here is outdated.
Thank you, I am aware of that sad news. I had worked with Andrew since 2020, and recently obtained a copy of the fcp file of the BabelStone Han font from his family. I planned to publish a commemorative version of BabelStone Han, a complete set of his CJK font work.