[BUG] Bicep Feature: '[Experimental] Runtime values in tags and sku' breaks PSRule

Description of the issue

When using the new experimental feature in Bicep from 0.46.1: https://github.com/Azure/bicep/releases
([Experimental] Runtime values in tags and sku)

resource example 'Microsoft...' = {
   name: 'example'
   location: resourceGroup().location
   sku: {
      name: this.existingResource().?sku.name ?? 'Standard'
   }
   tags: this.existingResource().?tags ?? {}
}

I now always get the following error shown in the error messages.

Error messages

Exception calling "GetBicepParamResources" with "2" argument(s): "Unable to expand resources because the source file '/home/vsts/work/1/s/main.bicep' was not valid. The deployment 'root/2026-08-07_14.45' with symbolic name 'hubResourceGroup' failed. An error occurred evaluating expression '[if(parameters('keepExistingTags'), union(coalesce(tryGet(target('full'), 'tags'), createObject()), parameters('tags')), parameters('tags'))]' line 701 at path 'tags'. The function "target" was not found."

Reproduction

Create a bicep file containing the new function:

resource example 'Microsoft...' = {
   name: 'example'
   location: resourceGroup().location
   sku: {
      name: this.existingResource().?sku.name ?? 'Standard'
   }
   tags: this.existingResource().?tags ?? {}
}

Version of PSRule

2.9.0

How are you running PSRule

Azure DevOps Microsoft Hosted Agent using the latest version of Linux, running in a PowerShell task using the latest version of bicep (0.46.1)

Additional context

No response

Start by reproducing the failure with the supplied Bicep resource on PSRule 2.9.0 and inspect the GetBicepParamResources path around evaluation of the target expression in tags. Done means the experimental runtime-values example is processed without the "target" function error, with regression coverage for this reproduction.