Using remote exec on multiple EC2 instances

Terraform
1 
Terraform v0.14.8

I am attempting to create multiple EC2 instances within Terraform, upload specific directories to each instances /var/tmp folder and then move those directories into an EFS mount on each instance. I am seeing some strange results when trying this with the code below, all the directories get successfully uploaded to each EC2 instance’s var/tmp folder but when we get to the remote-exec stage and it attempts to move the files they seem to be removed from the instance.

It weirdly looks like the first instances files get moved into the EFS volume correctly, the 2nd instance only copies a few of the files and then the third instance doesn’t work at all.

I am wondering if there is something wrong with my setup.

resource "aws_instance" "huski" {
  count = var.node_count

  ami = data.aws_ami.ecs.id
  associate_public_ip_address = true
  iam_instance_profile = aws_iam_instance_profile.huski_ec2.name
  instance_type = "t2.micro"
  key_name = format("huski_%d", count.index)
  subnet_id = element(var.vpc_public_subnets, 0)

  vpc_security_group_ids = [
	aws_security_group.huski.id]

  lifecycle {
	create_before_destroy = true
	prevent_destroy = false
  }

  depends_on = [
	aws_key_pair.generated_key
  ]

  user_data = join("\n",
  [
	"#!/bin/bash\necho ECS_CLUSTER=${var.ecs_cluster_name} > /etc/ecs/ecs.config",
	data.template_file.script[count.index].rendered
  ])

  provisioner "file" {
	source = format("nodes/node_%d", count.index)
	destination = "/var/tmp"

	connection {
	  type = "ssh"
	  user = "ec2-user"
	  private_key = tls_private_key.huski[count.index].private_key_pem
	  host = self.public_ip
	}
  }

  tags = {
	Name = format("%d-huski-terraform", count.index)
  }
}

resource "null_resource" "move_files" {
  count = var.node_count

  provisioner "remote-exec" {
	inline = [
	  "sudo mv -v ${format("/var/tmp/node_%d/", count.index)} /mnt/efs_node_data/",
	]

	connection {
	  type = "ssh"
	  user = "ec2-user"
	  private_key = tls_private_key.huski[count.index].private_key_pem
	  host = aws_instance.huski[count.index].public_ip
	}
  }

  depends_on = [
	aws_instance.huski
  ]
}