For some reason my first answer did not post. The problem is a bent shift fork or two. The forks move left and right to move slider gears to engage into other sets of gears. Don't expect to see the bend in a bent fork. A bent fork looks just like a good one. The bend is very slight. With the gearbox opened up you can manually shift through the gears to see the gear shifting patterns. Some shift patterns require two forks to achieve the shift. Some patterns require only one. You can look to see what yours requires. Below is a generic diagram of how the shift forks move slider gears.
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