When fetching the list of owners for a collectible item using the newer Collectibles endpoint, the response omits the created and updated timestamps that are present in the older Assets endpoint.
Affected endpoint:
GET /v2/collectible-items/{collectibleItemId}/owners (inventory.roblox.com)
Each item in the data array only returns collectibleItemInstanceId, serialNumber, and owner (id, type, name).
Comparison endpoint:
GET /v2/assets/{assetId}/owners (inventory.roblox.com)
Each item in the data array here additionally returns created and updated fields.
The problem: the old asset owners API (/v2/assets/{assetId}/owners) does not work with bundles/collectibles, so for bundle-based limited items the collectible-items endpoint is the only option. Since that endpoint does not return created or updated, there is currently no way to obtain when a collectible instance was created or last updated for these items.
Steps to reproduce: Call GET /v2/assets/{assetId}/owners for a regular limited asset and note that each owner record includes created and updated timestamps. Then call GET /v2/collectible-items/{collectibleItemId}/owners for a collectible/bundle item and observe that the returned owner records contain no created or updated fields. The assets endpoint cannot be used as a fallback because it does not support bundles/collectibles.
Reference docs: Inventories | Documentation - Roblox Creator Hub
Expected behavior
The /v2/collectible-items/{collectibleItemId}/owners endpoint should return created and updated timestamps for each owner instance, matching the behavior of the /v2/assets/{assetId}/owners endpoint. This would let developers retrieve creation/update times for collectible and bundle items, which currently is not possible through any working API.