Undefined opts when use yield (v2.6.2)

[syuilo]

When use yield, value of this.opts will be undefined.

ℹ️ This bug only occurs on v2.6.2.

<my-tag>
  <my-container>
    <my-x message={ message }></my-x>
  </my-container>

  <script>
    this.message = 'hello there'
  </script>
</my-tag>

<my-container>
  <yield />
</my-container>

<my-x>
  <h1>{ message }</h1>

  <script>
    this.message = this.opts.message // <- undefined
  /*
    console.log(this.opts)
      => { message: undefined }
  */
  </script>
</my-x>

Repoduce Code
http://plnkr.co/edit/ffnPUvlfqkiPmN8G3Da3?p=info

Riot: 2.6.2

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Thanks. 🍕

[GianlucaGuarini]

closing duplicate of #1866 #1973
riot yield tags expressions get evaluated using the values of the tag where they get injected