I found the solution! :-) Maybe someone will have the same problem, so I write in detail about how to do it.
First of all,
Light2D is not intended for use in control nodes, so it is better to try to get rid of it. But if you (like me) need light there, you can use this trick, which solves the problem of displaying lighting effects.
Place all elements that require lighting effects in a separate
Viewport and display it at the right coordinates over the control nodes:
Viewport, set the parameter values:
Msaa : 4x;
Fxaa : true;
Also, specify the size of the
Done! I hope this information will be helpful to someone. Have a nice day!