load command inside gdb CLI doesn't flash new image into device

I use `west debug` to start `gdb` for debugging nRF5340DK

when I use `west build` to update the image, I use `load` command inside gdb CLI, the new `zephyr.elf` is loaded, then `mon reset` and `continue` but the execution (changed text inside LOG_) still remains, I think the load doesn't flash the device as intended.

(gdb) mon flash download=1
Flash download enabled
(gdb) load
Loading section rom_start, size 0x154 lma 0x8000
Loading section text, size 0x4464c lma 0x8154
Loading section .ARM.exidx, size 0x8 lma 0x4c7a0
Loading section initlevel, size 0xa8 lma 0x4c7a8
Loading section device_area, size 0xa0 lma 0x4c850
Loading section sw_isr_table, size 0x228 lma 0x4c8f0
Loading section app_shmem_regions, size 0x8 lma 0x4cb18
Loading section _static_thread_data_area, size 0x2c lma 0x4cb20
Loading section ctors, size 0xc lma 0x4cb4c
Loading section log_const_area, size 0xc0 lma 0x4cb58
Loading section log_backend_area, size 0x10 lma 0x4cc18
Loading section zephyr_dbg_info, size 0x41 lma 0x4cc28
Loading section shell_area, size 0x30 lma 0x4cc6c
Loading section shell_root_cmds_area, size 0x30 lma 0x4cc9c
Loading section shell_subcmds_area, size 0x14 lma 0x4cccc
Loading section shell_dynamic_subcmds_area, size 0xc lma 0x4cce0
Loading section rodata, size 0xb594 lma 0x4ccf0
Loading section datas, size 0x5c0 lma 0x58a84
Loading section device_states, size 0x10 lma 0x59044
Loading section log_mpsc_pbuf_area, size 0x44 lma 0x59054
Loading section log_msg_ptr_area, size 0x4 lma 0x59098
Loading section log_dynamic_area, size 0x60 lma 0x5909c
Loading section k_mem_slab_area, size 0x20 lma 0x590fc
Loading section k_mutex_area, size 0x14 lma 0x5911c
Loading section k_sem_area, size 0x18 lma 0x59130
Loading section net_buf_pool_area, size 0x34 lma 0x59148
Loading section kobject_data, size 0x5d0 lma 0x5917c
Loading section .last_section, size 0x4 lma 0x5974c
Start address 0x00017f20, load size 331593
Transfer rate: 477 KB/sec, 7055 bytes/write.
(gdb) mon reset
Resetting target
(gdb) c
Continuing.

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