How to flash a new custom partition?

Hi,
I have added a partition outside of the app, which is also in ext4 format. I am already updating flash. sh, as shown in the figure:
image

The XML file has also been updated, as shown in the figure:

However, during the flashing process, the partition was not flushed

Found 16 partitions in SDMMC_USER (instance 3)
I> Writing A_mb1 partition.
I> Writing A_psc_bl1 partition.
I> Writing A_nvdec partition.
I> Writing A_mb2 partition.
I> Writing A_xusb-fw partition.
I> Writing A_bpmp-fw partition.
I> Writing A_bpmp-fw-dtb partition.
I> Writing A_psc-fw partition.
I> Writing A_mts-mce partition.
I> Writing A_sc7 partition.
I> Writing A_pscrf partition.
I> Writing A_mb2rf partition.
I> Writing A_cpu-bootloader partition.
I> Writing A_secure-os partition.
I> Writing A_eks partition.
I> Writing A_dce-fw partition.
I> Writing A_spe-fw partition.
I> Writing A_rce-fw partition.
I> Writing A_adsp-fw partition.
I> Writing B_mb1 partition.
I> Writing B_psc_bl1 partition.
I> Writing B_nvdec partition.
I> Writing B_mb2 partition.
I> Writing B_xusb-fw partition.
I> Writing B_bpmp-fw partition.
I> Writing B_bpmp-fw-dtb partition.
I> Writing B_psc-fw partition.
I> Writing B_mts-mce partition.
I> Writing B_sc7 partition.
I> Writing B_pscrf partition.
I> Writing B_mb2rf partition.
I> Writing B_cpu-bootloader partition.
I> Writing B_secure-os partition.
I> Writing B_eks partition.
I> Writing B_dce-fw partition.
I> Writing B_spe-fw partition.
I> Writing B_rce-fw partition.
I> Writing B_adsp-fw partition.
I> Writing B_VER partition.
I> Writing A_VER partition.
I> Writing device 1: 3.
I> Writing A_kernel partition.
I> Writing A_kernel-dtb partition.
I> Writing B_kernel partition.
I> Writing B_kernel-dtb partition.
I> Writing esp partition.
I> Writing APP partition.
I> Writing APP_b partition.
I> Writing secondary_gpt_backup partition.
I> Writing BCT partition.
I> Writing BCT-boot-chain_backup partition.
I> Writing A_MB1_BCT partition.
I> Writing B_MB1_BCT partition.
I> Writing A_MEM_BCT partition.
I> Writing B_MEM_BCT partition.
I> Rebooting : reset-coldboot

How can i flash new custom partition?