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{ status: this.step.status, dueDate: this.step.due_date }

this does not work if you are using an arrow function for assigning your data: 

data: () => ({
  somevar: this.messageId // undefined
}),
Because this will not point to the component. Instead, use a plain function 

data: function() {
  return { somevar: this.messageId }
},
or ES6:
data() {
    return { somevar: this.messageId }
}

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