Custom picklist values in Pipeline Task

Hi,

I have created an extension that adds an Azure Pipelines Task. The inputs for the task contain a picklist and it's being populated by using sourceDefinitions. This has always worked fine but roughly around August 2022 it has stopped working.

The definition of the task looks like this:

    "inputs": [
        {
            "name": "workItemType",
            "type": "picklist",
            "label": "WorkItem Type",
            "defaultValue": "",
            "required": true,
            "helpMarkDown": "The type of workitems to update, e.g. User Story, Task or Bug. You can use a comma-separated string to supply multiple values."
        }
    ],
    "sourceDefinitions": [
        {
            "target": "workItemType",
            "endpoint": "/$(system.teamProject)/_apis/wit/workItemTypes?api-version=1.0",
            "selector": "jsonpath:$.value[*].name",
            "authKey": "tfs:teamfoundation"
        }        
    ]

If I try to populate the dropdown in the UI, it will execute a request to https://bluebasher-sandbox.visualstudio.com/_apis/distributedtask/endpoint
With the following payload:

{
    "url": "/TestWiki/_apis/wit/workItemTypes?api-version=1.0",
    "selector": "jsonpath:$.value[*].name",
    "connectionId": "tfs:00025394-6065-48CA-87D9-7F5672854EF7",
    "scope": "f9bd23c4-e6b5-4e71-96c7-d4daa63f7943",
    "taskId": "7164116a-ed17-48be-9c53-b440b2b1dd2e",
    "keySelector": ""
}

And it returns this error:

{
    "$id": "1",
    "innerException": null,
    "message": "No service connection found with identifier tfs:00025394-6065-48CA-87D9-7F5672854EF7.",
    "typeName": "Microsoft.TeamFoundation.DistributedTask.WebApi.EndpointNotFoundException, Microsoft.TeamFoundation.DistributedTask.WebApi",
    "typeKey": "EndpointNotFoundException",
    "errorCode": 0,
    "eventide": 3000
}

So it seems to me that somewhere the authkey tfs:teamfoundation is being replaced by an actual (internal?) Service Connection, which does not exists anymore?

Start by reproducing the Pipeline Task picklist request using the shown sourceDefinitions payload and trace how authKey "tfs:teamfoundation" becomes the connectionId sent to the endpoint. Done means the work item type values populate without the EndpointNotFoundException; the issue names no repository files or tests to start from.