Broken Rohloff drive sprocket

Broke

Broken Rohloff 17t drive sprocket

Veda and I were nearly home when our Santos Double Travel broke down!  Here is the photo of the drive sprocket, which also shows 2 more fissures (12 & 5 o’clock)  considering that the chain is always pulling straight so there is no lateral force applied to the sprocket, I wonder if anyone else has experienced this problem.  I would really like to understand how this can happen.

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