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issue13500 (in test corpus)

This regressed when landing #13566. 

What is the expected behavior? (add screenshot)
<img width="664" alt="image" src="https://user-images.githubusercontent.com/942640/122467522-7bc8aa80-cf6f-11eb-9d4d-311eb7c64fb2.png">


What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/942640/122467565-85eaa900-cf6f-11eb-9c10-8a8686ed440c.png)


return new RefElement(attrs);
  }
  static script(attrs) {
    return new Script(attrs);
  }
  static setProperty(attrs) {
    return new SetProperty(attrs);
  }
  static signData(attrs) {
    return new SignData(attrs);
  }
  static signature(attrs) {
    return new Signature(attrs);
  }
  static signing(attrs) {
    return new Signing(attrs);
  }
  static solid(attrs) {
    return new Solid(attrs);
  }
  static speak(attrs) {
    return new Speak(attrs);
  }
  static stipple(attrs) {
    return new Stipple(attrs);
  }
  static subform(attrs) {
    return new Subform(attrs);
  }
  static subformSet(attrs) {