How to properly cut an object with a gradient? What am I doing wrong?

[pawełc23062395]

Photo number two is the effect of cropping without expansion. As you can see, some of the graphics have disappeared. Lines. Why did the remaining objects remain?

Photo number three is the effect of cutting after earlier extension.

When I create an ordinary object like a square, cover it with a gradient and cut it, that's no problem. As I choose another, more complicated, the problem begins.

[Monika Gause]

Exactly how did you build this?

Exactly how did you cut it?

[pawełc23062395]

At the beginning lines are drawn with a pen tool. Then I connected the paths and turned on the gradient. But as I saw what was happening, I started using the line tool.
I came to the point that I was able to cut properly, but you can see the lines from below. In photo 2 you can see such a thin black. Why?

I use crop tool (pathfinder).

[Monika Gause]

How did you build? Did you use live paint?

And what does #3 mean - when does that appear?

Can you also please show what's inside the layers panel of all three of your images?

And also the outline view

[pawełc23062395]

In this case, I didn't use live painting. In figure 0 you can see how I started. I created the lines and then marked everything and covered it with a gradient.
Photograph # 3 looks just as I turn the extension. Then I cut the element and this effect comes out immediately.

[pawełc23062395]

In this case, in the last photo (outline view). This is what it looks like right after extension, without cropping.

[Monika Gause]

Why does this need to be cut and expanded? It's going to be a pattern, right?

[pawełc23062395]

Yes.

I would normally use clipping mask here but it must be swatch.

[Monika Gause]

You don't need to clip or cut the objects. Just put an invisible rectangle at the bottom of your objects and then drag into the swatches panel. Invisible = no fill/no stroke.

Or use the pattern editing mode to create the pattern in the first place. https://helpx.adobe.com/illustrator/using/create-edit-patterns.html

[pawełc23062395]

If I make patterns for myself, I do exactly that. I put an invisible square, mark everything and add to the samples. It's worse if I do it for someone. I have to cut everything outside. Thanks. Maybe i have to create it once again.

[Monika Gause]

Why do you have to cut it when you make this for someone else?

All the pattern libraries in Illustrator have the invisible rectangle and excessive parts. So if it's right for Adobe, why should it be wrong for you?