Simulator fails to load when clicking Run on Declaring variables Help documentation page (Python example)

Describe the bug
On the Declaring variables Help documentation page, navigating to a Python variable example under The variable (var) statement section and clicking Run causes the simulator to fail to initialize.

Steps to reproduce the behavior:

1. Navigate to https://makecode.microbit.org/beta.
2. Open any existing tutorial with the Blocks editor.
3. In the Toolbox, open the Variables drawer.
4. Right click the first item and click the "Help" button.
5. Click any variable inline link in the description.
6. Open the Declaring variables Help documentation page.
7. Scroll down to The variable (var) statement section, click the second Run button.
8. Obverse the simulator behavior.

Actual behavior
The simulator area displays a white box with “loading…” indefinitely after clicking run.

Expected behavior
The simulator should load successfully and display the example animation, consistent with other examples in this help documentation.

Screenshots

Additional context
1.OS: Windows 11 25H2 & Mac Mini M2 macOS Tahoe 26.4.1
2.Browser: Chrome, Edge, Firefox, and Safari
3.Makecode.microbit.org version: 8.1.10
4.Microsoft MakeCode version: 12.3.5

Start by opening the Declaring variables Help documentation page and reproducing the second Run button failure in the “The variable (var) statement” section. Compare this Python example with the other examples that load successfully, then trace the embedded simulator setup. Done means the example simulator loads and displays its animation consistently with the other help examples.