Problem with Blueprint

Hello, I have some problems with the Blueprint menu in Unreal Engine 5. For example, when I want to create a new material, and I connect Multiply to the UVs of my Texture/NormalMap/LinearColor, the textures disappear and, as long as Multiply is connected, are replaced with the most present color. I have also tested this with other connections, and more often the same problem appeared. Unreal Engine 5 does not give me an error message or anything else. I have also checked if it is my inability by copying the blueprint of a tutorial, but I got the same result. This problem occurs when I use Multiply/Constant and LinearInterploat

It’s because the multiple node should not be connected to the UVs on it’s own.

Either

or

There are many things you can multiply and feed into UVs, but not zero.