This also happens in the free version of C3
the mouse wheel does not scroll in the layers window.
The layer window does not detect the scroll performed with the mouse wheel.
It is mandatory to scroll by clicking on the sidebar of the layers window.
Only the separate layer window, reduced and with a number of layers so that you have to scroll through it and you can prove that the mouse wheel does not work in this window.
Steps to reproduce bug
Place the cursor in the layer window and scroll through it using the mouse wheel, you will notice that it does not work.