Moving notes diatonically gets stuck when a previous note in the bar has an accidental

Alt+Shift+Down is supposed to move a note down the diatonic scale, but it stalls when trying to move it lower than a previous note in the same bar with a sharp accidental. In the example here, if you select the C and use the shortcut, it will move down to B as expected, but then it will move to B♭, enharmonic to the previous A♯, and then it will continue to stay at the same pitch, probably because it is still on the B line, but the A space represents the same pitch since the accidental hasn't been cancelled.
The same thing happens in the bar that has a D♯ and an F, if the F is moved down with the same shortcut; it goes to E, then E♭, and then stays at E♭ when the shortcut is used again.