Method 1

You can try automatic vectorization, which is more convenient:

Vectorization generating element

Method 2

That is, where there are breakpoints and blanks in the vector tracking project, it cannot be completed. You need to hold down the S key and click on the blank space to continue vectorization. When there are grid segments, you can continue vector tracking by releasing the S key. It is equivalent to building a bridge in a blank place to let the vector segment pass. You can also choose the sketch tool in the blank space of the editor, that is, pencil to edit. I hope it works.

Method 3

That is, where there are breakpoints and blanks in the vector tracking project, it cannot be completed. You need to hold down the S key and click on the blank space to continue vectorization. When there are grid segments, you can continue vector tracking by releasing the S key. It is equivalent to building a bridge in a blank place to let the vector segment pass. You can also choose the sketch tool on the editor and edit it with a pencil in the blank.