For a correct portalID, projectID and bugID (id_string) I get the following response from the server: This looks nothing like the expected response from the documentation. Also the associated_task array is empty.
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My setup: I use zoho flow to make the api calls. I have a ZOHO Projects connection I have setup and use in various different flows. I use both, /restapi and /api/v3.
There is an Issue/Bug in a project that is associated to a task. as you can see in the picture below. In the request I tried both, the id and the id_string property from the Bug object. The response with the id was "Resource not found" while with the id_string it gave me the output above.