hello.
Why in micropython\ports\rp2\CMakeLists.txt RP2350 board defaults to 4MB Flash?
IMHO Pico2 boards use built-in flash in MCU, and it is only 2MB.

if(DEFINED PICO_FLASH_SIZE_BYTES)
target_link_options(${MICROPY_TARGET} PRIVATE
-Wl,--defsym=micropy_flash_size=${PICO_FLASH_SIZE_BYTES}
)
elseif(PICO_RP2040)
target_link_options(${MICROPY_TARGET} PRIVATE
-Wl,--defsym=micropy_flash_size=2048k # Default to 2MB
)
elseif(PICO_RP2350)
target_link_options(${MICROPY_TARGET} PRIVATE
-Wl,--defsym=micropy_flash_size=4096k # Default to 4MB
)
endif()