Same issue with kernel 6.8.1-1-MANJARO for a microSD card with extfat file system (not encrypted).
sudo mount /dev/sdc1 /mnt/disk/
[sudo] Mot de passe de steph :
FUSE exfat 1.4.0 (libfuse3)
fuse: mount failed: Device or resource busy
Journalctl message:
mars 21 18:45:31 steph-bureau udisksd[2183571]: fuse: mount failed: Device or resource busy
mars 21 18:45:31 steph-bureau udisksd[2183571]: FUSE exfat 1.4.0 (libfuse3)
mars 21 18:45:31 steph-bureau kernel: /dev/sdc1: Can't open blockdev