Please update your repo/playbook.
TASK [gentoo : Create Grub BIOS Partition] *************************************
fatal: [too1]: FAILED! => {"changed": false, "err": "/usr/sbin/parted: invalid token: bios_grub\n", "msg": "Error while running parted script: /usr/sbin/parted -s -m -a optimal /dev/sda -- unit KiB set 1 bios_grub on", "out": "", "rc": 1}
Please update your repo/playbook.