I haven't used ExFAT on macOS regularly since the OS X days, but some old notes of mine say:

1. After each “write session” to an ExFAT volume, open Terminal and type “fsck_exfat -d disk<dnumber>s<snumber>” where <dnumber> is the disk number and <snumber> is the partition number of your ExFAT volume 2. Avoid deleting files on ExFAT volumes using a Mac!