Packer 1.7.3 * "{{user `kms_key_id`}}" is not a valid KMS Key Id

Hi Team,
The same works with Packer 1.7.2 but breaks with 1.7.3 which got released yesterday Jun 15 2021. Just bringing to your attention, I tried with alias and arn , failing for both.

  • “{{user kms_key_id}}” is not a valid KMS Key Id.

Packer-vars.json:
“kms_key_id”: “alias/xyz”