What-If does not report the expected preview for Key-Vault name change with 'Complete' mode

[ruma-paul-maersk]

In our bicep script we are creating 3 key-vaults and 1 application-insights resources in a resource-group. We run what-if command (as shown below) with "Complete" mode as a parameter before deploying the script.

az deployment group what-if --resource-group --mode Complete --template-file ${{ inputs.bicepTemplateFilePath }} --parameters $parameters

If we rename a key-vault (needed in some cases), "what-if" command does not mention (as expected with "Complete" mode) that the old key-vault will be deleted, and a new key-vault will be created. Rather, it only mentions that the old key-vault will be ignored, and does not mention about any new key-vault creation.

  + Create
  ~ Modify
  = Nochange
  * Ignore
  x Noeffect

The deployment will update the following scope:

Scope: /subscriptions/<subscription>/resourceGroups/<resource-group-name>

  ~ Microsoft.Insights/components/<appinsights-name> [2020-02-02]
    + properties.Flow_Type:      "Bluefield"
    + properties.Request_Source: "rest"

  = Microsoft.ManagedIdentity/userAssignedIdentities/<ID> [2018-11-30]
  = Microsoft.OperationalInsights/workspaces/<log> [2021-06-01]
    x properties.features:

        disableLocalAuth:                            false
        enableDataExport:                            true
        enableLogAccessUsingOnlyResourcePermissions: true
        immediatePurgeDataOn30Days:                  false


  * Microsoft.KeyVault/vaults/<old-key-vault-name>
  * Microsoft.KeyVault/vaults/<another-key-vault-with-no-change>
  * Microsoft.KeyVault/vaults/<another-key-vault-with-no-change>

Resource changes: 1 to modify, 2 no change, 4 to ignore.

After running the "Create" command with "Complete" mode we find as expected that the key-vault with old name has been deleted and a key-vault with new name has been created (the deletion of the old key-vault has been verified as trying to create a key-vault with the same name threw error "the key-vault is in soft-deleted state").

az deployment group create --resource-group --mode Complete --template-file ${{ inputs.bicepTemplateFilePath }} --parameters $parameters

TBN, we have experimented by removing the mode parameter, so by default it is "Incremental" mode and received same output for What-if as with "Complete" mode

Is this expected behaviour of What-If for key-vault with "Complete" mode deployment?

[ruma-paul-maersk]

The behaviour is the same for ApplicationInsights resource as well, the only difference was: what-if mentioned that a new ApplicatioInsights resource will be created, even though it did not mention that the old one will be deleted.

[stefan-stanescu-maersk]

Could be related to #157

[stephaniezyen]

Duplicate of #253