glabel status; and GPT fdisk: write test failed with error number 1

# date ; uname -v
Sat Mar 27 18:19:40 GMT 2021
FreeBSD 14.0-CURRENT #90 main-n245648-66f138563be: Thu Mar 25 08:00:54 GMT 2021     root@mowa219-gjp4-8570p:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG
# freebsd-version -kru
14.0-CURRENT
14.0-CURRENT
14.0-CURRENT
# glabel status
             Name  Status  Components
     gpt/efiboot0     N/A  ada0p1
   msdosfs/EFISYS     N/A  ada0p1
     gpt/gptboot0     N/A  ada0p2
gpt/FreeBSD%20ZFS     N/A  da0p1
# gdisk /dev/da1
GPT fdisk (gdisk) version 1.0.6

NOTE: Write test failed with error number 1. It will be impossible to save
changes to this disk's partition table!
You may be able to enable writes by exiting this program, typing
'sysctl kern.geom.debugflags=16' at a shell prompt, and re-running this
program.

The protective MBR's 0xEE partition is oversized! Auto-repairing.

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): p
Disk /dev/da1: 7814304 sectors, 3.7 GiB
Sector size (logical): 512 bytes
Disk identifier (GUID): 79FF4872-B177-4EC2-BEEF-EB3FF8C56DE1
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 7814270
Partitions will be aligned on 128-sector boundaries
Total free space is 3165 sectors (1.5 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1             128         7811199   3.7 GiB     0700  Basic data partition

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/da1.
Unable to open device '/dev/da1' for writing! Errno is 1! Aborting write!

Command (? for help): q
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