Custom cursor works inside windows, but not on destkop background or title bar

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https://wiki.archlinux.org/title/KDE

Plasma cursor sometimes shown incorrectly
Create the directory ~/.icons/default and inside a file named index.theme with the following contents:

~/.icons/default/index.theme
[Icon Theme]
Inherits=breeze_cursors

Execute the following command:

$ ln -s /usr/share/icons/breeze_cursors/cursors ~/.icons/default/cursors

Personally, I applied a different method to fix this issue, I discovered the Arch wiki one’s after.

I directly modified my /usr/share/icons/default/index.theme with my custom theme, as hinted here by example.
https://www.arcolinuxd.com/how-to-fix-the-cursor-theme-on-plasma-cursor-is-not-applied-everywhere/

Looking further, it was already mentioned here:

KDE Cursor switches Style when pointing on Desktop

I have installed a Cursor theme on my KDE Manjaro. It works fine and looks good in most cases. But if the Cursor hovers over the Desktop or the Windows bar it suddenly changes size and appearence to the KDE classic cursor theme which I didnt select at any time. Applying the normal Breeze Cursors again it doesnt work anymore and still has the cursor switching problem.

It was driving me nuts, especially when I did not see this behaviour in KDE Neon or Kubuntu VMs.

I compared the default index.theme in a KDE Manjaro VM and those two, Manjaro has a xcursor-breeze something (on my phone right now), while the 2 others breeze_cursors something.