> Is it a filesystem limitation for 9999 files, or an actual Mac OS bug? Wikipedia claims that exFAT supports 2,796,202 files per directory. So to me that read

> Is it a filesystem limitation for 9999 files, or an actual Mac OS bug? Wikipedia claims that exFAT supports 2,796,202 files per directory. So to me that reads like some sort of filesystem driver bug. Either the camera isn't following the exFAT spec correctly and by chance both Windows and Linux happen to tolerate that behaviour and macOS doesn't, or conversely there's some sort of bug in the macOS exFAT implementation. You'd hope that in that situation Fuji would have double-checked its exFAT implementation, so maybe it is indeed a macOS bug?