The answer must be simple. The box on the corner shown below, what does it mean?
It is called a "Tack" and identifies a change of direction or "vertex" on a routed trace.
(see also Squares at junction of traces. )
In some other cases (not this one though), it will indicates an unroute when two connected pins are exactly at the ame x,y coordinate (either on the same side or opposite side of PCB).
Thank you, this was very helpful.
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