Since Catalina, some fonts on macOS have been put into a special "secret" mode where they are available, but are not enumerated: https://support.apple.com/en-in/HT210192 It appears that this is done in order to phase the fonts out, as the article refers to backwards-compatibility as reasoning for keeping them around, but at the same time, there does not seem to be any new alternatives. When using e.g. TextEdit, the text is resolved to the "secret" font, but the font dialog does not display it, indicating that you are using a non-existent font. This also causes issues for Qt, since we have our own fontdatabase and do our own matching. In order to work around it, we assume the font is available and manually add it to the database and fallback lists. This also appears to be what others are doing, e.g. Firefox. [ChangeLog][macOS][Text] Fixed missing text with certain writing systems on macOS Catalina and later. Pick-to: 5.15 6.2 6.4 Fixes: QTBUG-96384 Fixes: QTBUG-98920 Change-Id: Ifd08ccbfdd0c06e11a44be861ad2c275c5a8e339 Reviewed-by: Lars Knoll <lars@knoll.priv.no> Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>