Mate that's right through the hardening and bits will fall off soon. Inspect every gear.
Either you have been unlucky with a badly manufactured gear or there has been some other stress, perhaps oil related in the past.
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'07 EC300 GG
'14 TXT250 GG
'? 496 CPI Cheetah RZ/RGV hybrid
'22 765 Street Triple RS
'21 XTrainer
'69 Stinger T125 Suzuki
'23 TRS 250RR (it's a Trials thing)
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