macOS system fonts in older documents
When opening documents in 21.4.1.4 that were created in a version < 21.4 and that use macOS system fonts, those system fonts show as <Font Status="NotAvailable"/> in IDML exported from 21.4., and as FontStatus.NOT_AVAILABLE from the ExtendScript interface. They look installed and normal in Find/Replace Font.... Doing things to try to trigger a refresh, like app.updateFonts(), or typing inside a range of text in the document that uses the font, does not fix it; round-tripping IDML does.
This affects some of our automated workflows.
I'm not sure if this happens with every macOS system font, but I have seen it with more than one. The attached document, saved in 21.3, uses Avenir.
I would suspect that this problem was introduced by the fix for [ID-4272938] After installing a Windows 11 update, InDesign is unable to find the Times New Roman and Calibri fonts