For the same reason the "Content structure" menu (also known as "Document outline") is going to use in-page links, see #7142 and #10815, also the Blocks Navigation menu should use links.
Right now, the Blocks navigation buttons are used fot content navigation. They're emulating the hyperlinks behaviour "by moving keyboard (and viewport) focus to the relevant area, but the behaviour may be unpredictable to blind users".
For the same reason the "Content structure" menu (also known as "Document outline") is going to use in-page links, see #7142 and #10815, also the Blocks Navigation menu should use links.
Right now, the Blocks navigation buttons are used fot content navigation. They're emulating the hyperlinks behaviour "by moving keyboard (and viewport) focus to the relevant area, but the behaviour may be unpredictable to blind users".