Bruce, FWIW, we just got a manual 2020 Impreza (with a mighty 2.0 L making 152 HP and 145 lb-ft).
Apparently, to save costs, they carried over their 'old' five-speed in the Impreza, so it just might be the gearbox you're talking about. (All of their other current manual models get six-speeds.)
The car's too new to say anything about long-term reliability but it shifts OK, if a little notchy. Fifth is definitely more 'notchy' than the other gears. Hopefully, that will loosen up a bit in time.
Dunno what will be inside yours, but the stock ratios for this car are as follows: