In a mixed-language document, F1 might be a simple Type 1 font, while F2 and F3 are CIDFonts. The identifier (F1, F2, etc.) does not distinguish the type of font; it only distinguishes the instance of usage.

: Open the file in Mac Preview or a PDF editor and use "Export as PDF" to re-save it. This often "bakes in" the fonts and fixes the display.

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