Failing to mount (error 49244) exFAT external drive and First Aid gives exit code 45

I'm on a Macbook Air M1 2020 8GB 512GB with macOS Monterey 12.1, and I'm trying to access my WD P10 5TB external drive that contains data from my Windows laptop.

Mounting gives me error 49244, and First Aid gives me exit code 45 (error -69845), fsck_exfat -d gives me "FSOPS_ReadBootSector: Cluster size not supported: 2097152".

Is there a way I can fix this without losing data? Appreciate the help!

x@Ms-MacBook-Air ~ % diskutil list

...

/dev/disk4 (external, physical):

  #:            TYPE NAME          SIZE    IDENTIFIER

  0:   GUID_partition_scheme            *5.0 TB   disk4

  1:    Microsoft Basic Data ⁨WD_BLACK⁩        5.0 TB   disk4s1

x@Ms-MacBook-Air ~ % diskutil repairVolume /dev/disk4s1

Started file system repair on disk4s1 (WD_BLACK)

Checking file system and repairing if necessary and if possible

Volume is already unmounted

Performing fsck_exfat -y -x /dev/rdisk4s1

Checking volume

Checking main boot region

The volume could not be verified completely

File system check exit code is 45

Restoring the original state found as unmounted

Error: -69845: File system verify or repair failed

Underlying error: 45

x@MacBook-Air ~ % sudo fsck_exfat -d /dev/disk4s1

Password:

Opening /dev/rdisk4s1

** Checking volume.

** Checking main boot region.

fsck_exfat: FSOPS_ReadBootSector: Cluster size not supported: 2097152

** The volume could not be verified completely.