python3 /home/arch-dev/hadk/system/tools/mkbootimg/mkbootimg.py --kernel /home/arch-dev/Downloads/hybris-boot/kernel --ramdisk /home/arch-dev/Downloads/hybris-boot/ramdisk --second /home/arch-dev/Downloads/los-boot/second --base 0x10000000 --pagesize 2048 --cmdline loop.max_part=7 --ramdisk_offset 0x00000000 --second_offset 0x00000000 --tags_offset 0x00000000 --header_version 1 --output /home/arch-dev/Downloads/hybris-boot_with-2nd.img

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los boot.img details:

/home/arch-dev/hadk/system/tools/mkbootimg/unpack_bootimg.py --boot_img /home/arch-dev/Downloads/boot.img
boot_magic: ANDROID!
kernel_size: 23517196
kernel load address: 0x10008000
ramdisk size: 9318643
ramdisk load address: 0x10000000
second bootloader size: 133209
second bootloader load address: 0x10000000
kernel tags load address: 0x10000000
page size: 2048
os version: 11.0.0
os patch level: 2022-04
boot image header version: 1
product name:
command line args: loop.max_part=7 buildvariant=userdebug
additional command line args:
recovery dtbo size: 0
recovery dtbo offset: 0x0
boot header size: 1648

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hybris-boot.img (with "second") details:

/home/arch-dev/hadk/system/tools/mkbootimg/unpack_bootimg.py --boot_img /home/arch-dev/Downloads/hybris-boot_with-2nd.img
boot_magic: ANDROID!
kernel_size: 23666700
kernel load address: 0x10008000
ramdisk size: 1010308
ramdisk load address: 0x10000000
second bootloader size: 133209
second bootloader load address: 0x10000000
kernel tags load address: 0x10000000
page size: 2048
os version: 0.0.0
os patch level: 2000-00
boot image header version: 1
product name:
command line args: loop.max_part=7
additional command line args:
recovery dtbo size: 0
recovery dtbo offset: 0x0
boot header size: 1648