Building virtualbox-iso within nested virtualization does not type the boot command

_This issue was originally opened by @blaargh in https://github.com/hashicorp/packer/issues/11744 and has been migrated to this repository. The original issue description is below._

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#### Overview of the Issue

In our toolchain we want to build packer vm's from within a virtual machine. Nested VT-X is working correctly. When using _packer build_ to build Ubuntu 22.04 via virtualbox-iso, the boot command is not being typed.

#### Reproduction Steps

1. Get a Ubuntu vm running
2. Install virtualbox + packer
3. Build packer with the the template below

### Packer version

1.8.0

### Simplified Packer Template
https://gist.github.com/blaargh/eddca388c44099785e899edb67f28903

### Operating system and Environment details

Ubuntu 22.04 in virtual machine hosted on ESXi 6.7

### Log Fragments and crash.log files

2022/05/02 10:06:58 packer-builder-virtualbox-iso plugin: stdout: Waiting for VM "Ubuntu-Desktop-22.04" to power on...
2022/05/02 10:06:58 packer-builder-virtualbox-iso plugin: VM "Ubuntu-Desktop-22.04" has been successfully started.
2022/05/02 10:06:58 packer-builder-virtualbox-iso plugin: stderr:
==> virtualbox-iso: Waiting 4s for boot...
==> virtualbox-iso: Typing the boot command...
==> virtualbox-iso: Using SSH communicator to connect: 127.0.0.1
==> virtualbox-iso: Waiting for SSH to become available...
2022/05/02 10:07:06 packer-builder-virtualbox-iso plugin: [INFO] Waiting for SSH, up to timeout: 2h46m40s

Nothing is crashing, the boot command just instantly moves on to the SSH command