When in the Configure System window, I want to add a "Kanboard Token Credential", but the list of credentials only shows none and secret text (from the plain-credentials plugin) but nothing from the credentials plugin, where I have stored the jsonrpc user and password that is required to access the Kanboard application. This means I always get a 401 error when using the "Test Connection" button, even though the endpoint and the API token are entered correctly. I can see the credentials for the jsonrpc user in other plugin configurations but not this one.