Auto-complete not working with Custom-tagged union data type

```bicep

@discriminator('type')
type virtualNetwork = existingVirtualNetwork | newVirtualNetwork

type existingVirtualNetwork = {
type: 'existing'
virtualNetworkId: string
nextHopIpAddress: string?
}

type newVirtualNetwork = {
type: 'new'
customName: string?
customVirtualNetworkPeeringName: string?
addressSpace: string[]
dnsServers: string[]?
existingVirtulNetworkHubId: string?
nextHopIpAddress: string?
}

param virtualNetwork = {
type: 'new'
addressSpace: [
'10.10.0.0/16'
]

}
```

I expect dat ik kan use complete when filling in the property, but it does not.