Describe the bug

There's an extra bit of vertical line on blocks with hats in zelos.

To Reproduce

Steps to reproduce the behavior:

1. Go to the advanced playground
2. Select the zelos renderer.
3. Select the testhats theme.
4. Open the Connections > Stack category and the Basic category.
5. Observe how the blocks with hats have extra vertical lines on their endward side.

Expected behavior

No extra vertical lines.

Screenshots