Just a guess, these secondary images (which are always in the ROM anyway) need some manual “repackaging” after the build completes.
Try this to extract them [Walkthrough] Extract eRecovery and boot images using payload-dumper-go
Just a guess, these secondary images (which are always in the ROM anyway) need some manual “repackaging” after the build completes.
Try this to extract them [Walkthrough] Extract eRecovery and boot images using payload-dumper-go