Management API GET ProductCatalogGroupsSortList returns 500: serialization of System.Type is not supported ($.Model.SaveCommandType)

[Justinvolved]

Describe the bug

The Management API query ProductCatalogGroupsSortList always fails with HTTP 500, because its model exposes a SaveCommandType property of type System.Type, which System.Text.Json refuses to serialize. The sort order of the top-level groups in a shop therefore cannot be read over the API, while the matching save command works. A tool that reorders groups has to write the order blind.

To Reproduce

1. GET /Admin/Api/ProductCatalogGroupsSortList?ShopId=SHOP1 with a valid API key.

Observed (DW 10.28.11):

HTTP 500
{"type":"https://tools.ietf.org/html/rfc9110#section-15.6.1",
 "title":"Serialization and deserialization of 'System.Type' instances is not supported. Path: $.Model.SaveCommandType.",
 "status":500}

Also seen on 10.28.10.

Expected behavior

HTTP 200 with the sorted list of groups for the shop. SaveCommandType is marked [JsonIgnore] (or exposed as a type name string) so the model serializes.

Environment

• Dynamicweb 10.28.11 (.NET 10 hosting)