Someone else reported it, but I'm just adding further data point. A similar bug related to killing enemies with crits was fixed some versions ago, so this is something new (this item has been sitting in my inventory for a while with an enchantment).
I have literally no idea when this item lost its enchantment, so cannot provide a relevant output_log (though I included one anyway in case it happened during this current play session), but I can at least provide a save where this is curr