Sanity check wanted: does this error make sense?

[davidgiven]

The type checker in strict mode is producing this error. I cannot for the life of me see what's wrong. The key it's complaining about not finding is right there in the definition I've printed. I'm not going mad, right? directories is one of the listed top-level keys? If that's correct, what might be causing this?

src/lua/addons/templates.lua:50: type error: Key 'directories' not found in table '{ debug: { currentword: boolean,
location: boolean, memory: boolean }, directories: { autosaves: nil, templates: string }, gui: { [string]: any, 
font_bold: any, font_bolditalic: any, font_italic: any, font_regular: any, font_size: number, 
window_height: number, window_width: number }, lookandfeel: { denseparagraphs: boolean, enabled: boolean, 
fullstopspaces: boolean, maxwidth: number, palette: string, scrollmode: string, terminators: boolean }, 
recents: {string}, systemdictionary: { filename: string } }'

This particular type definition comes from a general settings table where the type is accumulated from code all throughout the program contributing their own key, so statically declaring the type definition would be hard.