The crash is radical, the UI disappear.  Like if the process exited without further notice
% mount      
/dev/disk1s5s1 on / (apfs, sealed, local, read-only, journaled)
devfs on /dev (devfs, local, nobrowse)
/dev/disk1s2 on /System/Volumes/Preboot (apfs, local, journaled, nobrowse)
/dev/disk1s4 on /System/Volumes/VM (apfs, local, noexec, journaled, noatime, nobrowse)
/dev/disk1s6 on /System/Volumes/Update (apfs, local, journaled, nobrowse)
/dev/disk1s1 on /System/Volumes/Data (apfs, local, journaled, nobrowse)
map auto_home on /System/Volumes/Data/home (autofs, automounted, nobrowse)
exfat://disk3s1/T7-Black on /Volumes/T7-Black (exfat, local, nodev, nosuid, noowners, mounted by nroy)
The mount for exfat returns an URI for DeviceID (exfat://disk3s1/T7-Black).  And disk util fail to resolve this URI.
% diskutil info exfat://disk3s1/T7-Black
Could not find disk: exfat://disk3s1/T7-Black
If using the mount point (/Volumes/T7-Black) instead, diskutil will work
% diskutil info /Volumes/T7-Black
 Device Node:               /dev/disk3s1
   Whole:                     No
   Part of Whole:             disk3
   Volume Name:               T7-Black
   Mounted:                   Yes
   Mount Point:               /Volumes/T7-Black
   Partition Type:            Microsoft Basic Data
   File System Personality:   ExFAT