Sync-AzVirtualNetworkPeering does not syncing peerings

### Description

Sync-AzVirtualNetworkPeering ends with success but the status for peering is still RemoteNotInSync
Owner permissions on both Hub and Spoke subscriptions.
Same happening using REST API and az cli [ az network vnet peering sync ]

### Issue script & Debug output

```PowerShell
Body:
{
"name": "xxx",
"id": "/subscriptions/xxx/resourceGroups/xxx/providers/Microsoft.Network/virtualNetworks/vnet-xxx-prod-westeurope/virtualNetworkPeerings/xxx",
"etag": "W/\"47108532-4444-4aff-baal-bc21fb62534c\"",
"properties": {
"provisioningState": "Succeeded",
"resourceGuid": "0fc7cb15-cccc-4444-2381-b2a48e07dbe4",
"peeringState": "Connected",
"peeringSyncLevel": "RemoteNotInSync",
"remoteVirtualNetwork": {
"id": "/subscriptions/xxx/resourceGroups/rg-xxx-network-westeurope/providers/Microsoft.Network/virtualNetworks/vnet-xxx-westeurope"
},
"allowVirtualNetworkAccess": true,
"allowForwardedTraffic": true,
"allowGatewayTransit": false,
"useRemoteGateways": false,
"doNotVerifyRemoteGateways": false,
"peerCompleteVnets": true,
"remoteAddressSpace": {
"addressPrefixes": [
"10.xx.xx.xx/28"
]
},
"remoteVirtualNetworkAddressSpace": {
"addressPrefixes": [
"10.xx.xx.xx/28"
]
},
"routeServiceVips": {}
},
"type": "Microsoft.Network/virtualNetworks/virtualNetworkPeerings"
}

DEBUG: 1:43:52 PM - [ConfigManager] Got nothing from [DisplayRegionIdentified], Module = [], Cmdlet = []. Returning default value [True].
DEBUG: 1:43:52 PM - [ConfigManager] Got nothing from [CheckForUpgrade], Module = [], Cmdlet = []. Returning default value [True].
DEBUG: AzureQoSEvent: Module: Az.Network:7.4.0; CommandName: Sync-AzVirtualNetworkPeering; PSVersion: 7.4.1; IsSuccess: True; Duration: 00:00:11.5268240
DEBUG: 1:43:52 PM - [ConfigManager] Got [True] from [EnableDataCollection], Module = [], Cmdlet = [].
DEBUG: 1:43:52 PM - SyncAzureVirtualNetworkPeeringCommand end processing.
```

### Environment data

```PowerShell
Name Value
---- -----
PSVersion 7.4.1
PSEdition Core
GitCommitId 7.4.1
OS CBL-Mariner/Linux
Platform Unix
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
```

### Module versions

```PowerShell
ModuleType Version PreRelease Name ExportedCommands
---------- ------- ---------- ---- ----------------
Script 2.15.1 Az.Accounts {Add-AzEnvironment, Clear-AzConfig, Clear-AzContext, Clear-AzDefault…}
Script 7.1.1 Az.Compute {Add-AzImageDataDisk, Add-AzVhd, Add-AzVMAdditionalUnattendContent, Add-AzVMDataDisk…}
Script 7.4.0 Az.Network {Add-AzApplicationGatewayAuthenticationCertificate, Add-AzApplicationGatewayBackendAddressPool, Add-AzApplicationGatewayBackendHttpSetting, Add-AzApplicationGat…
Script 6.15.0 Az.Resources {Export-AzResourceGroup, Export-AzTemplateSpec, Get-AzDenyAssignment, Get-AzDeployment…}
Script 6.1.1 Az.Storage {Add-AzRmStorageContainerLegalHold, Add-AzStorageAccountManagementPolicyAction, Add-AzStorageAccountNetworkRule, Close-AzStorageFileHandle…}
Script 1.1.3 Az.Tools.Predictor {Disable-AzPredictor, Enable-AzPredictor, Open-AzPredictorSurvey, Send-AzPredictorRating}
Script 0.0.0.10 AzureAD.Standard.Preview {Add-AzureADApplicationOwner, Add-AzureADDeviceRegisteredOwner, Add-AzureADDeviceRegisteredUser, Add-AzureADDirectoryRoleMember…}
Script 0.9.3 AzurePSDrive
```

### Error output

```PowerShell
There is no error. Run is successful but the peering's are still not synchronized.
```

Start by reproducing Sync-AzVirtualNetworkPeering with the issue script and compare the resulting peeringSyncLevel with the REST API and az network vnet peering sync behavior. The issue is resolved when a successful sync leaves the peering synchronized, or the command clearly reports the underlying failure or limitation.

Written by the indexing model from the issue text.