hasBlock always returns true for curly components in beta and canary

[voltidev]

Here's simplified code with the problem.

{{#card-form card=model as |form|}}
  {{!-- hasBlock will be `false` in 3.14 and `true` in beta and canary --}}
  {{form.submit-button}}

  {{!-- hasBlock will be true in any version --}}
  {{#form.submit-button}}
    Block text
  {{/form.submit-button}}
{{/card-form}}

card-form.hbs:

{{yield
  (hash submit-button=(component "card-submit-button"))
}}