Big Sur Bootcamp stuck partitioning

I have a 2016 MBP with Big Sur and 170GB of internal drive space free and when trying to use Bootcamp to partition the drive with an 80GB disc for Windows 10 and it is stuck in the partitioning phase at ~40%…

What can I do to complete the process?

Attempting to quit the app complains that the process hasn’t been completed so it can’t quit. My only choice has been to close the MBP until later.

Here is the output of diskutil list:

$ diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.3 GB   disk0
   1:                        EFI ⁨EFI⁩                     314.6 MB   disk0s1
   2:                 Apple_APFS ⁨Container disk1⁩         500.0 GB   disk0s2

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +500.0 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume ⁨Macintosh HD - Data⁩     313.4 GB   disk1s1
   2:                APFS Volume ⁨Preboot⁩                 292.7 MB   disk1s2
   3:                APFS Volume ⁨Recovery⁩                611.0 MB   disk1s3
   4:                APFS Volume ⁨VM⁩                      6.4 GB     disk1s4
   5:                APFS Volume ⁨Macintosh HD⁩            15.1 GB    disk1s5
   6:              APFS Snapshot ⁨com.apple.os.update-...⁩ 15.1 GB    disk1s5s1

/dev/disk2 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            CCCOMA_X64FRE_EN-GB... +5.4 GB     disk2

After what amounts to 2.5hrs (the MBP was closed for about a day, but went to sleep and awoke just fine) I see "Your disk could not be partitioned":

I then ran the First Aid in Disk Utility which claimed to be successful:

However, upon running Bootcamp and going through the disk partitioning again, I had the same result as first seen above ("Your disk could not be partitioned.")