Compile error after removing the KERNEL_DIR

[ztmzzz]

I am building the Pixel 8 Pro ROM and encountered an issue in the scripts/3_build_rom.sh script. The relevant section of the script is:

KERNEL_DIR=$(ls "device/google/${DEVICE_GROUP}-kernels/${KERNEL_VERSION}" | grep -v '.git')
rm -rf "device/google/${DEVICE_GROUP}-kernels/${KERNEL_VERSION}/${KERNEL_DIR}/*"
cp -Rfv ../kernel_out/* "device/google/${DEVICE_GROUP}-kernels/${KERNEL_VERSION}/${KERNEL_DIR}/"

If I completely remove the contents of the KERNEL_DIR folder, the build process fails with the error: missing drm/samsung_drm.h
However, if I copy the contents of kernel_out into KERNEL_DIR without deleting the existing files, the build works fine. It seems that KERNEL_DIR contains some essential files that are not present in kernel_out.
I think the rm command can be removed.