My 5.0 Foot Plate assembly is as shown in this pic, is yours? If not, please post a pic of your remaining attached foot plate.
If yes, I suppose that it's possible your cotter (hairpin type) was 'sprung' and fell-out on its own, allowing the clevis to work its way out and the foot plate to drop off. Or perhaps something 'snagged' the cotter pulling it out then allowing the rest to follow.
I know on mine the detent shape of the cotter makes it quite resistant to pulling out, between that and its location it's an unlikely candidate for 'snagging' / inadvertent removal.
Unfortunately, methinks your cotter or entire foot plate was likely liberated by some neer-do-well along the way. Replacing the cotter with a split ring could deter that sort of thing, they can be found in the hardware aisle at Lowes / Home Depot.
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