Breakpoint in a callback function from iPyWidgets Jupiter Notebook not breaking in VsCode

Question

I created a Jupyter Notebook cell with this code

from ipywidgets import widgets

def test_fun(button):
    for i in range(10): # breakpoint in this line
        print(i)

# Button to split in 12 months
test_button = widgets.Button(description="Click Me!")
test_button.on_click(test_fun)
display(test_button)

Then I set a breakpoint in "for i in range(10)". I expected the debugger to start when I clicked the test_button, but that didn't happen. You can see in the screenshot the cycle runs uninterrupted.

I tried this in JupyterLabs without a problem. I also tried the jupyter.debugJustMyCode": false option, although it doesn't seem applicable to this case.

Also, breakpoints outside the test_fun work as expected.

Versions:

• Visual Studio Code: 1.95.3
• jupyter_server: 2.14.2
• ipywidgets: 8.1.1