crash when local variable removed

[phillip-constantine]

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Overview of the Issue

If I comment out a specific local variable, packer crashes on 'build' and 'validate' commands

Reproduction Steps

Not sure exactly, but I think it's:

1. reference an original local inside another local
2. delete the original local
3. run a build command

Might be exacerbated by having this spread across multiple files

Packer version

1.12

Simplified Packer Template

https://gist.github.com/phillip-constantine/8297fafdc3d98182e67fef416ee89c5b

Operating system and Environment details

Ubuntu 22.04 x86_64, running Packer in Docker

Log Fragments and crash.log files

https://gist.github.com/phillip-constantine/8297fafdc3d98182e67fef416ee89c5b

[anurag5sh]

This is a duplicate of #13295, which we've already started working on. The solution is being developed in #13340. You can follow the discussion and changes there. We'll close this once the PR is merged.

[github-actions]

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