Invalid value for field 'resource.networkInterfaces': ''. Updating 'networkInterface' is not supported

We successfully use deployment manager since 2018 for deploying an infrastructure with multiple subnetworks, many instances and Docker apps inside these instances. Today the deployment manager started returning the following error during the deployment:

```
Invalid value for field 'resource.networkInterfaces': ''. Updating 'networkInterface' is not supported
```

The full error message:

```json
{
"ResourceType": "compute.v1.instance",
"ResourceErrorCode": "400",
"ResourceErrorMessage": {
"code": 400,
"errors": [
{
"domain": "global",
" message": "Invalid value for field 'resource.networkInterfaces': ''. Updating 'networkInterface' is not supported.",
"reason": "invalid"
}
],
"message": "Invalid value for field 'resource.networkInterfaces': ''. Updating 'networkInterface' is not supported.",
"statusMessage": "Bad Request",
"requestPath": "https://compute.googleapis.com/compute/v1/projects/xxx/zones/us-east1-b/instances/yyy",
"httpMethod": "PUT"
}
}
```

The request body for the corresponding `PUT` request:

```yml
name: yyy
properties:
disks:
- autoDelete: true
boot: true
deviceName: boot
initializeParams:
sourceImage: https://www.googleapis.com/compute/v1/projects/cos-cloud/global/images/family/cos-stable
type: PERSISTENT
machineType: https://www.googleapis.com/compute/v1/projects/xxx/zones/us-east1-b/machineTypes/f1-micro
networkInterfaces:
- network: https://www.googleapis.com/compute/v1/projects/xxx/global/networks/default
subnetwork: $(ref.zzz.selfLink)
serviceAccounts:
- email: default
scopes:
- https://www.googleapis.com/auth/devstorage.read_write
- https://www.googleapis.com/auth/logging.write
- https://www.googleapis.com/auth/monitoring.write
- https://www.googleapis.com/auth/servicecontrol
- https://www.googleapis.com/auth/service.management.readonly
zone: us-east1-b
type: compute.v1.instance
```

This request body wasn't modified during the last year.