hello 854792408,
you may found this in the release notes.
it’s a known issue that rootfs on SD card is restricted to 14 GB when using flash.sh to write to an SD card.
please have an alternative ways to generate the SD card image using script files; it creates APP partition at the end, and resizefs works properly to extend the SD card capacity.
you may also check similar discussion threads for reference, for example, Topic 75749, and Topic 73032
thanks