Id and PartitionKey properties are missing on ChangeFeedMetadata class

[JensSchadron]

We are continuously addressing and improving the SDK, if possible, make sure the problem persist in the latest SDK version.

Describe the bug
When using the full fidelity change feed mode (AllVersionsAndDeletions), I'm using the ChangeFeedItem<T> wrapper class to receive either the creation, update or deletion of the a document. However, upon deletion, I should be able to receive the id and partitionkey of the deleted document in the ChangeFeedMetadata property as stated in the docs. (https://learn.microsoft.com/en-us/azure/cosmos-db/nosql/change-feed-modes?tabs=all-versions-and-deletes#parse-the-response-object-1) However, those 2 specific properties are missing on the object.

To Reproduce

1. Set up an AllVersionsAndDeletions changefeed
2. Delete a document from the collection being observed by the changefeed
3. Observe ChangeFeedMetadata property of ChangeFeedItem for the deleted document

Expected behavior
I can use the id and partitionkey properties from the ChangeFeedMetadata class.

Actual behavior
The 2 mentioned properties are missing.

Environment summary
SDK Version: 3.47.0-preview.0

Additional context
N/A

[JensSchadron]

Also noticed that the Previous property of ChangeFeedItem<T> is seemingly never filled in, despite the XML docs mentioning that it should be the case.

azure-cosmos-dotnet-v3/Microsoft.Azure.Cosmos/src/Resource/FullFidelity/ChangeFeedItem.cs

Lines 73 to 78 in a5469f2

	/// <summary>
	/// For delete operations, previous image is always going to be provided. The previous image on replace operations is not going to be exposed by default and requires account-level or container-level opt-in.
	/// </summary>
	[JsonProperty(PropertyName = "previous", NullValueHandling = NullValueHandling.Ignore)]
	[JsonPropertyName("previous")]
	public T Previous { get; set; }

[JensSchadron]

And... just noticed that there's apparently a PR (#4922, albeit drafted) that should resolve the original issue (as well as the XML doc that I just mentioned)...

[onionhammer]

Why is this only supported in preview for .net but other languages it's GA?

[msfreed]

The delete operation in the change feed is pretty useless without the Id and partitionKey being serialized into the metadata. Is there any update on this being addressed?

[JensSchadron]

And... just noticed that there's apparently a PR (#4922, albeit drafted) that should resolve the original issue (as well as the XML doc that I just mentioned)...

Just for reference, linking to a new PR (#5191 ) which used to previously mentioned PR as a base

[TomMalow]

What's the outlook of this being resolved? seems like the PR is close to done but is it weeks or month?

Currently on a larger cosmos migration task of around 10 cosmos accounts that needs to be migrated with no downtime. So looking at a combination of LastVersion mode for historical data and AllVersionsAndDeletions to track deleted data while migrating to ensure these are deleted in target database.
Agree with @msfreed that this mode is useless without these properties in the delete operation. Can't see how it usefull to know that "something" was deleted.

[JensSchadron]

For those who're subscribed to this issue. As of version 3.55.0, PR #5470 (which in turn used #5191 as a base) has been merged in, making those 2 missing properties available. However, this became at the expense of CRTS becoming nullable in the SDK (I've already raised an issue for that for those who're interested: #5508 )