Why doesn't 13_4 img (1.3G) write to a 4 G memstick?

I'm trying to create a bootable backup memory stick on a 4G stick.

 From https://download.freebsd.org/releases/amd64/amd64/ISO-IMAGES/13.4/
File Name  ↓ 	File Size  ↓ 	Date  ↓
FreeBSD-13.4-RELEASE-amd64-memstick.img	1342689792	2024-Sep-13 10:15

That looks like 1.3 G to me.

$ xz --decompress < /hd2/Downloads/FreeBSD/13_4/FreeBSD-13.4-RELEASE-amd64-memstick.img.xz | dd of=/dev/da0 bs=1M conv=sync
dd: /dev/da0: short write on character device
dd: /dev/da0: end of device
3824+0 records in
3823+1 records out
4009745920 bytes transferred in 1526.615472 secs (2626559 bytes/sec)
Prior to writing, the memstick looked like this:

$ gpart show -l da0
=>     63  7831472  da0  MBR  (3.7G)
        63  7831472    1  (null)  (3.7G)

$ gpart list da0
Geom name: da0
modified: false
state: OK
fwheads: 255
fwsectors: 63
last: 7831534
first: 63
entries: 4
scheme: MBR
Providers:
1. Name: da0s1
    Mediasize: 4009713664 (3.7G)
    Sectorsize: 512
    Stripesize: 0
    Stripeoffset: 32256
    Mode: r0w0e0
    efimedia: HD(1,MBR,00000000,0x3f,0x777fb0)
    rawtype: 11
    length: 4009713664
    offset: 32256
    type: fat32
    index: 1
    end: 7831534
    start: 63
Consumers:
1. Name: da0
    Mediasize: 4009745920 (3.7G)
    Sectorsize: 512
    Mode: r0w0e0

After writing:

$ gpart show -l da0
=>      1  7831534  da0  MBR  (3.7G)
         1    66584    1  (null)  (33M)
     66585  2555856    2  (null)  [active]  (1.2G)
   2622441  5209094       - free -  (2.5G)

$ gpart list da0
Geom name: da0
modified: false
state: OK
fwheads: 255
fwsectors: 63
last: 7831534
first: 1
entries: 4
scheme: MBR
Providers:
1. Name: da0s1
    Mediasize: 34091008 (33M)
    Sectorsize: 512
    Stripesize: 0
    Stripeoffset: 512
    Mode: r0w0e0
    efimedia: HD(1,MBR,0x90909090,0x1,0x10418)
    rawtype: 239
    length: 34091008
    offset: 512
    type: efi
    index: 1
    end: 66584
    start: 1
2. Name: da0s2
    Mediasize: 1308598272 (1.2G)
    Sectorsize: 512
    Stripesize: 0
    Stripeoffset: 34091520
    Mode: r0w0e0
    efimedia: HD(2,MBR,0x90909090,0x10419,0x26ffd0)
    attrib: active
    rawtype: 165
    length: 1308598272
    offset: 34091520
    type: freebsd
    index: 2
    end: 2622440
    start: 66585
Consumers:
1. Name: da0
    Mediasize: 4009745920 (3.7G)
    Sectorsize: 512
    Mode: r0w0e0

Despite the website claim of 1.3G size,
it looks like the uncompressed file is larger than 4G; dd said it transferred
4G+ bytes.  But da0s2 says it's only 1.2G after the failed write.
Piped into wc -c it says 1342689792 (1.3G)

Is there some magic I need to invoke?