Fully expect this to get ignored, but here you go. Mac OS 10.15.7, SL 7.0.30.
Click with the rectangular selection tool and drag so that your cursor exits the SL window. Expected behavior: the selection expands to reach the edge of the spectrograph. Actual behavior: the selection completely disappears.
This makes selecting right to the edge of the spectrograph infuriating, because you need to either stop short of the edge (meaning you haven’t selected the full range of time/frequency) or carefully release your click while the mouse is over the window’s narrow border. Otherwise you’ll lose your entire selection.