[PyGObject] invisible paths between Gtk.TreeView.get_visible_range() ?

The documentation about Gtk.TreeView.get_visible_range() says:

"Returns the first and last visible path. Note that there may be
invisible paths in between."

I have stomachache about the fact that there could be "invisible paths
in between". But the documentation here keeps mystic.
Why is it so? In which cases are there invisible paths?

I need to prevent this situations.

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