Missing property "properties" in virtualNetworkGateway1 attribute of Microsoft.Network/Connections@2024-01-01

Bicep
```bicep
resource erGw 'Microsoft.Network/virtualNetworkGateways@2024-01-01' = {
name: '${sitePrefix}-ergw'
location: location
properties: {
gatewayType: 'ExpressRoute'
ipConfigurations: [
{
name: 'vnetGatewayConfig0'
properties: {
privateIPAllocationMethod: 'Dynamic'
publicIPAddress: {
id: ergwPublicIp.id
}
subnet: {
id: subnetGateway.id
}
}
}
]
sku: {
name: erGwSku
tier: erGwSku
}
}
}

resource erConn 'Microsoft.Network/connections@2024-01-01' = {
name: '${sitePrefix}-erconn-0'
location: location
properties: {
connectionType: 'ExpressRoute'
authorizationKey: erAuthorization
peer: {
id: erCircuitId
}
virtualNetworkGateway1: {
id: erGw.id
}
}
}
```

> Warning BCP035: The specified "object" declaration is missing the following required properties: "properties". If this is an inaccuracy in the documentation, please report it to the Bicep Team. [https://aka.ms/bicep-type-issues]

EDIT: The warning references line 101, which is the virtualNetworkGateway1 line. This is also underlined yellow in VSCode. The deployment successfully runs as expected with the ExpressRoute successfully connected.

Start with the Microsoft.Network/connections@2024-01-01 type definition and compare the virtualNetworkGateway1 declaration with the Bicep example in the issue. Check the generated diagnostic for line 101; done means the valid ExpressRoute resource no longer reports BCP035 while deployment behavior remains unchanged.

Written by the indexing model from the issue text.