virtual segment delete tool

Hi

I'm using this tool to erase some parts of polylines. In the attached image is an example of what it's happening. I guess is a problem of Corel Draw to recognize that two lines intersect when one of them ends on another. This particular problem (the one of the rectangle) is already solved. However, I want to know, in general, what this tool erases, or how to get what I want.

Thanks for your help, and sorry if I'm not clear, but English is not my native language

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