To expand on the previous comment, the issue can be resolved post boot by running update-grub which will fill out the missing values on the search line. It appears the build process is either not running update-grub or it is using a default grub template that is missing the appropriate data.
To expand on the previous comment, the issue can be resolved post boot by running update-grub which will fill out the missing values on the search line. It appears the build process is either not running update-grub or it is using a default grub template that is missing the appropriate data.