Old windows button image does not disappear with new custom start button

[ltcomdata]

Describe the bug

In Windows 11, when the start button is replaced by a custom button, the image of the old button (the windows logo) does not get erased, but is only covered up by the new custom start button. But if the new custom button is not big enough, or does not have the right shape, or is not positioned correctly, the old image still shows up (or partially shows up) behind the new start button.

Area of issue

Taskbar

To reproduce

Add a custom start button which is not big enough.

Expected behavior

I expected the old start button to completely disappear and get replaced entirely by the new custom start button.

Open-Shell version

4.4.196

Windows version

Windows 11 Home 24H2

Additional context

No response