The reason the ring gear teeth gets damaged is that the starter drive gear teeth and ring gear teeth meet head on instead of meshing.
The cause of that could be insufficient bevel of the gear teeth or the one way slip clutch in the starter drive is seized or the starter solenoid is not working properly causing the starter drive to bang in and out....Or one made a mistake and accidentally hit the key when the engine was running
It has nothing to do with 6 to 12 volt(or 12v to 24v) starters as the starter drive is always fully engaged in the ring gear before the starter starts spinning.
I have 1 belarus tractor I converted from 12 to 24 volt for starting 27 years ago. I wore out 1 starter and 2 starter drives.
The ring gear has still all its teeth and was never replaced.
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