In my experience this type of damage is unfixable in RAW photos unless the entire image looks 'off'. For example I have been able to repair files like this where entire image looks distorted with NEF and ARW type RAW files: https://youtu.be/3IT2fhBkK5w. In this case maximum achievable is extraction of embedded JPEG data (BTW this type of damage is repairable to a degree if it concerns JPEG data).
I have seen similar damage on storage devices that were formatted with some flavor of FAT where it was actually related to a corrupt file allocation table. exFAT is slightly different from FAT/FAT32 in the sense that it does not keep FAT entries for a file IF the file is stored in contiguous block of clusters. So could be file system is incorrectly assuming file is contiguous, or could file is fragmented while FAT is corrupt.
As this is SSD can also be corruption at level of SSD firmware (translator (maps LBA <> PBA) corrupt). This type of damage happens mostly in SSD's that are powered on all the time, as odd as this may sound.
This is always problem with corrupt files, is it the actual file data that got corrupted at some point, or is there an underlying cause? It is important because based on what's wrong, solutions will differ (if any solution at all). If you discover this type of damage right after copying files from the memory card, try recovering them from the memory card. If recovered files are good, then something in between the card and SSD is not working correctly. If recovered files suffer from exact same issue, try totally different hardware (card reader / cables). If issue persists, data was corrupt from the start.