ApiManagementProductCollection.GetAllAsync Method expandGroups flag doesn't work, should it?

In my application using the Azure.ResourceManager.ApiManagement nuget package version 1.3, I'm retrieving all products and I want to get the groups for those products in a single call instead of having to later query product by product,

The documentation indicates setting the expandGroups flag as true in the request will add this as a property in the response but this is not working for me. On particular LLM claimed that "The parameter exists for parity with older SDKs, but the Azure.ResourceManager SDK models (ApiManagementProductData) do not expose a Groups property at all. So you can’t rely on expandGroups in this SDK to populate group relationships." is this true?

My code

var results = await _cache.GetOrCreateAsync(AllProductsCacheKey, async entry =>
   {
         entry.AbsoluteExpirationRelativeToNow = TimeSpan.FromMinutes(AbsoluteInMemoryCacheExpirationInMinutes);
         var result = new List<ApiManagementProductResource>();
         await foreach (var item in productCollection.GetAllAsync(
         filter: "state eq 'published'",
         expandGroups: true,
         top: ApimCallMaximumRecordsCount, 
         cancellationToken: cancellationToken))
         {
            result.Add(item);
         }
      return result;
   });
}
return results;

The results Data property doesn't include any property with the groups