Nintendos exfat drivers are buggy
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so i translated a text which describes whats with Switch ExFat driver:
Ever since the start of the homebrew scene, users have been warned against using exFAT for microSD cards for the switch, as this leads to long-term data loss. The reason is that Nintendo's FAT driver is faulty and constantly changes files and folders, even with simple reads. The changes are never correctly synchronized with the file system, which means that if an application is terminated improperly / a reboot / shutdown occurs, the file handlers are lost and are then missing in the file allocation table. This also happens with FAT32.
Since exFAT, unlike FAT32, does not have a second backup file allocation table, the data and folders are irretrievably lost.