Current macOS keeps PingFang and other on-demand fonts in its asset
store, which the font scan never walked, so Chinese text showed as
boxes. The scan now also walks the com_apple_MobileAsset_Font* folders
of /System/Library/AssetsV2 (and the older /System/Library/Assets) with
the same depth, size and file checks, and Hiragino Sans GB and Heiti SC
(preinstalled) join the Chinese UI faces and the text fallbacks.
Tested with a folder laid out the same way; not run on a Mac.
bflatastic
91c80a19cc