# Bug Report: Jupyter Notebook transform output registration UI is broken in Code Workspaces **URL:** \ **Category:** Product Feedback\ **Tags:** code-repositories\ **Created:** [September 30, 2026, 3:02pm UTC](https://community.palantir.com/t/bug-report-jupyter-notebook-transform-output-registration-ui-is-broken-in-code-workspaces/7300 "2026-09-30T15:02:39Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![demilich](https://avatars.discourse-cdn.com/v4/letter/d/d07c76/32.png) [@demilich](https://community.palantir.com/u/demilich)\ **Post date:** [September 30, 2026, 3:02pm UTC](https://community.palantir.com/t/bug-report-jupyter-notebook-transform-output-registration-ui-is-broken-in-code-workspaces/7300/1 "2026-09-30T15:02:39Z")
**Summary:** Jupyter Notebook transform output registration UI is broken in Code Workspaces **Steps to reproduce:** 1. Open a JupyterLab workspace in Code Workspaces 2. In the **Data** panel, add a dataset intended as an output. 3. Create a JupyterLab workbook, importing the dataset 4. Attempt to register the workbook as a Report 1. Create panel does not display an outputs section 2. Instead outputs are listed with inputs 3. The hotdog menu on the dataset row, selecting **Mark as output** — the dataset disappears from the panel entirely rather than moving to an outputs section. **Expected behavior:** The Edit Transform panel should display a clearly labelled outputs section, and marking a dataset as an output should move it there. **Actual behavior:** No outputs section is visible in the Edit Transform panel. Using “Mark as output” causes the dataset to vanish from the panel. **Impact:** Unable to register output datasets for Jupyter Notebook transforms through the UI, resulting in `AliasNotRegisteredAsAnOutput` errors at runtime (`ConjureHTTPError: 400`, `ErrorName: FoundryDataSidecar:AliasNotRegisteredAsAnOutput`).