SetDefaultLanguage.ps1 Error with -Language input

in SetDefaultLanguage.ps1 at rule 154 it is referring to $languagecode but if the language is already installed, this string will be empty. Packer logs show:

[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:22 ui: azure-arm: *** Starting AVD AIB CUSTOMIZER PHASE: Set default Language ***
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:24 ui: azure-arm:
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:24 ui: azure-arm: TaskPath TaskName State
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:24 ui: azure-arm: -------- -------- -----
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:24 ui: azure-arm: \Microsoft\Windows\LanguageComponentsInstal... Installation Disabled
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:24 ui: azure-arm: \Microsoft\Windows\LanguageComponentsInstal... ReconcileLanguageResources Disabled
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:25 packer-plugin-azure plugin: 2024/07/10 09:30:25 [INFO] command 'powershell -executionpolicy bypass -file "C:/Windows/Temp/packer-elevated-shell-668e5495-8087-f1de-1e21-d5c34530f737.ps1"' exited with code: 0
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:25 packer-plugin-azure plugin: 2024/07/10 09:30:25 [INFO] RPC endpoint: Communicator ended with: 0
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:25 [INFO] 1538 bytes written for 'stdout'
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:25 [INFO] 0 bytes written for 'stderr'
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:25 ui: azure-arm: *** AVD AIB CUSTOMIZER PHASE : Set default language - Language pack for nl-NL is installed already***
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:25 [INFO] RPC client: Communicator ended with: 0
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:25 [INFO] RPC endpoint: Communicator ended with: 0
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:25 packer-provisioner-powershell plugin: [INFO] 1538 bytes written for 'stdout'
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:25 packer-provisioner-powershell plugin: [INFO] 0 bytes written for 'stderr'
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:25 ui: azure-arm: *** AVD AIB CUSTOMIZER PHASE: Set default Language - Exception occurred***
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:25 packer-provisioner-powershell plugin: [INFO] RPC client: Communicator ended with: 0
[611cec67-e529-47b8-89a9-021fca6ccdde] PACKER 2024/07/10 09:30:25 ui: azure-arm: System.Management.Automation.ParameterBindingValidationException: Cannot bind argument to parameter 'Language' because it is null.