live usb with persistence

I'm trying to create persistence on a live usb drive. This worked in
December but now it isn't. How is it different from than when it worked?

usb=/dev/sdc
sudo fdisk $usb <<< $(printf "n\np\n\n\n\nw")
usb=/dev/sdc

sudo mkfs.ext4 -L persistence ${usb}3
usb=/dev/sdc
sudo mkdir -p /mnt/my_usb
sudo mount ${usb}3 /mnt/my_usb
echo "/ union" | sudo tee /mnt/my_usb/persistence.conf
sudo umount ${usb}3


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