Could you update GCC version from current 12.2.1 to 13.2.1? - https://github.com/xpack-dev-tools/arm-none-eabi-gcc-xpack/releases/tag/v13.2.1-1.1 This update may also resolve previously posted issue. - https://github.com/stm32duino/Arduino_Core_STM32/issues/2138 - http://nemuisan.blog.bai.ne.jp?eid=244160 (Japanese page)