New Filters broke parameters with type number

[Dawid]

I've had this parameter for years: 

parameter: comparison_type {
    type: number
    allowed_value: {
      label: "Current vs Previous"
      value: "0"
    }
    allowed_value: {
      label: "Last Completed vs Previous"
      value: "-1"
    }
    default_value: "0"
  }

And suddenly it's rendered with a number not a label:

I actually can't even change it to -1 if I wanted to. What happened?