There is a bug in versions >= SDK 5.47 (Kiota change?) when fetching a multivalued list item from sharepoint

Describe the bug

We fetch items from a sharepoint list like this:

var graphItems = graphClient.Sites[siteId].Lists[listId].Items;
var listItems = await graphItems.GetAsync(o => o.QueryParameters.Expand = new[] { "Fields" }); 

Then serialize and print one item in the list:

var dic = item.Fields.AdditionalData;
var json = JsonSerializer.Serialize(dic);

In SDK versions prior to 5.47, the output would look like this (I am only showing the property that has the issue):

{"RenewalStatus":[{"LookupId":6,"LookupValue":"Dead - see general status"},{"LookupId":21,"LookupValue":"Removed at CPA"}]}

In SDK versions from 5.47 onwards (tested to 5.50) the output to the same item is this:

{"RenewalStatus":{}}

When I look the AdditionalData dictionary, the type of the property in question was previously an array, but from 5.57 onwards it is Microsoft.Kiota.Abstractions.Serialization.UntypedArray.

Expected behavior

I believe I have described the steps to reproduce in the question, but in the sharepoint list the field is a "Lookup" field with allow multiple values enabled.

How to reproduce

As per the code in my description.

SDK Version

5.47 to latest (5.50)

Latest version known to work for scenario above?

5.46 and before

Known Workarounds

I am fixing our projects to Graph 5.46 until this is fixed or until it is clearer why this information is not being returned in the last few versions of the SDK. This is clearly an SDK change and not a sharepoint change given reverting to the older SDK resolves the issue.

Debug output

</details>


### Configuration

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### Other information

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