WhatIf always displaying "no change" when using functions in uri path

**Describe the bug**
We're using a quite complex way of calculating the path of the linked template to use. The what-if always returns "no change".
If I hard-code in the template the result of the calculation, the what-if is instead successful.

Example of non-working:
"uri": "[concat(variables('modulesPath'), 'ResourceGroup/1.0.74/deploy.json', if(parameters('componentsStorageContainerIsPrivate'), concat('?', listAccountSas(parameters('componentStorageAccountId'), '2019-04-01', variables('accountSasProperties')).accountSasToken), ''))]",

Same template, with hard-coded value & working
"uri": "https://iacs.blob.core.windows.net/components/Modules/ARM/ResourceGroup/1.0.74/deploy.json?",

**To Reproduce**
Examples in the attached file: [whatiftest.zip](https://github.com/Azure/arm-template-whatif/files/6063588/whatiftest.zip)

1. Store a template (deploy.json in the attachment) in a storage account. Container should be private
2. Create a template linking the template stored in the storage account (use whatiftest.json and parameters.json in the attachment)
3. Try the whatif deploying the template (whatiftest.json)

4. Use the hard-coded value and verify the whatif works

**Expected behavior**
Same result in (3) and (4)

**Client** [e.g. PowerShell, CLI, API)
PowerShell 7.1.2
Az.Resources 3.2.1

Start with the attached whatiftest.zip, especially deploy.json, whatiftest.json, and parameters.json, and reproduce the deployment using PowerShell 7.1.2 with Az.Resources 3.2.1. Compare the function-based URI with the hard-coded URI during what-if. Done means both forms produce the same what-if result rather than reporting no change.

Written by the indexing model from the issue text.