Message routing not working for null value in properties

[amit12cool]

I have a message route query on iotHub like below:-
IS_OBJECT($twin.properties.reported.deviceOperations) OR $twin.properties.reported.deviceOperations = null

Expected result:-

Message should be delivered to the endpoint having twin like below:-

	"properties": {
		"reported": {
			"deviceOperations": {
				"6a8e9bb0-631b-42ad-a3ec-7c8fe4a67c6c": {
					"requestType": "fileDownload",
					"metadata": {
						"key": "value"
					},
					"blobName": "<Some_BLob_Name>",
					"progressUpdate": false,
					"de88a4ed-6eb0-483b-a929-cf0ae544e0df": {
						"wipe": true
					}
				}
			},
     }

This is getting delivered and is working fine due to the IS_OBJECT query in message routing

The problem/issue arises in the second query for json below

"properties": {
		"reported": {
			"deviceOperations":  null
     }
}

this is not getting delivered to the endpoint but it should due to this condition $twin.properties.reported.deviceOperations = null.

And the reported property deviceOperations is getting cleared in twin but somehow not delivered to the endpoint.
Also when i put the message routing query as true I get the message in my endpoint as below
[EventHubMonitor] [9:21:31 AM] Message received:

{
  "version": 6,
  "properties": {
    "reported": {
      "deviceOperations": null,
      "$metadata": {
        "$lastUpdated": "2024-11-26T03:51:31.5199729Z",
        "deviceOperations": null
      },
      "$version": 3
    }
  }
}

So only the condition $twin.properties.reported.deviceOperations = null in message routing doesn't work

Am I missing anything?

Note:- The test works in the Azure UI portal for above JSON.

[lev-i]

I don't think you can use = null.

Have you tried using:
IS_NULL($twin.properties.reported.deviceOperations)
or
NOT IS_DEFINED($twin.properties.reported.deviceOperations)

That should get the routing working as expected.