cellComponent not working with Octane components

cellComponent doesn't appear to be working with Ember Octane components:

routes/mytable.js

model = { 
  columns: [
  {
    name: "Foo",
    valuePath: "foo"
  }, {
    name: "Test",
    cellComponent: 'test'
  }
],
rows: [
  {
    "foo": "This is a test",
  }
]}

components/test.hbs

<p>Testing component</p>

templates/mytable.hbs

<EmberTable as |t|>
       <t.head 
          @columns={{@model.columns}} 
          @enableResize={{true}} 
          @enableReorder={{false}} 
          @sorts={{@model.sorts}}
          @onUpdateSorts={{action (mut @model.sorts)}} />
       <t.body @rows={{model.rows}} />
</EmberTable>

This results in the table rendering as expected, with the first column displaying "This is a test" as expected, but nothing appearing in the second column with the cellComponent.

Start with the reproduction in routes/mytable.js, components/test.hbs, and templates/mytable.hbs, then run the table with the shown columns and rows. Compare the working valuePath column with the cellComponent column; done means the second column renders “Testing component” for the provided row.