It would very hard for the toggle to fail if locked, it would be under compression, all the force being transfered straight back to the toggle axle and thus the fork.
The fork broke at the sharp cut where the opening transition is, a weak spot due to the "corner" present.
If the fork was over hard, or brittle to begin with; then use over the years could cause cracks radiating from each corner, and a final failure- perhaps even with standard ammo.
We don't know enough about this to call it an ammo problem just yet, likely a contributor- yes; for certain = unknown without more info. JMHO.
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