Error transforming component with a helper that does not use positional params as an attribute

[devotox]

Original

{{#ct-input
        classNames="flex-grow"
        type="time"
        label="Arrive between"
        clearable=(not readOnly)
        disabled=readOnly
        defaultDate=(luxon hour=8 minute=0)
        placeholder="Now"
        date=stop.timeWindowEarliestTime

        onClear=(pipe
          (action (mut stop.timeWindowEarliestTime) null)
          (ct-orm "saveStopOfPlan" stop)
        )

        onSave=(pipe
          (action (mut stop.timeWindowEarliestTime))
          (ct-orm "saveStopOfPlan" stop)
        )
        as |input|
      }}

Transformation

 <CtInput 
    @classNames="flex-grow" 
    @type="time" 
    @label="Arrive between" 
    @clearable={{not readOnly}} 
    @disabled={{readOnly}} 
    @defaultDate=<Luxon @hour={{8}} @minute={{0}} /> 
    @placeholder="Now" 
    @date={{stop.timeWindowEarliestTime}} 
    @onClear={{pipe (action (mut stop.timeWindowEarliestTime) ) (ct-orm "saveStopOfPlan" stop)}} 
    @onSave={{pipe (action (mut stop.timeWindowEarliestTime)) (ct-orm "saveStopOfPlan" stop)
}} as |input|>

As you can see the issue here is with defaultDate