Packer doesn't import project ssh keys (googlecompute) - google-cloud-platform

Question

Packer seems to exclude ssh keys from the project but I have set the block-project-ssh-keys value to false. The final command fails but that user has an ssh key tied to the project.
Any ideas?
{
"builders": [
{
"type": "googlecompute",
"project_id": "mahamed901",
"source_image_family": "ubuntu-1804-lts",
"ssh_username": "packer",
"zone": "europe-west1-b",
"preemptible": "true",
"image_description": "Worker Node for Jenkins (Java + Docker)",
"disk_type": "pd-ssd",
"disk_size": "10",
"metadata": {"block-project-ssh-keys":"false"},
"image_name": "ubuntu1804-jenkins-docker-{{isotime | clean_image_name}}",
"image_family": "ubuntu1804-jenkins-worker"
}
],
"provisioners": [
{
"type": "shell",
"inline": [
"sudo apt update",
"#sudo apt upgrade -y",
"#sudo apt-get install -y git make default-jdk",
"#curl https://get.docker.com/ | sudo bash",
"uptime",
"sudo curl -L \"https://github.com/docker/compose/releases/download/1.23.1/docker-compose-$(uname -s)-$(uname -m)\" -o /usr/local/bin/docker-compose",
"sudo chmod +x /usr/local/bin/docker-compose",
"sleep 5",
"cat /etc/passwd",
"#sudo usermod -aG docker jenkins",
"#sudo docker ps",
"#rm ~/.ssh/authorized_keys"
]
}
]
}

Answer 1

This is controlled by metadata option block-project-ssh-keys true or false.
See this issue
(the format of your metadata is wrong, remove the square brackets [ ].)