Why does gulp-less compile files that start with an underscore?

Question

JavaScript

There is such a gulp task. In theory, it should not compile files that start with an underscore. But it still tries to compile them.
This is how the project structure looks like:
The folder itself with less files

Here are the files inside

At the same time, if you just try to compile the file into which the rest are included (styles.less), then not everything is compiled for some reason.
PS Here's what happens when you compile according to my task:

It starts compiling all Less files separately into css files