It can't get to third without rolling the changer through the 2nd gear position. In the second gear position, the dogs that engage have no choice but to move into position where the dogs go into the adjoining drive gear, so it is likely that the dogs were broken off. They might be large enough to drop into the case and sit there. The only fix might be to replace those two gears, or maybe just one of them (the one with the dogs).
The only way to verify the damage is to crack the case open.
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-NOS 2020 KTM 250SX (2-stroke motocross)
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