Attributes are not populated with their default values

[K1R0J]

Describe the bug When adding a widget the default values of attributes are not set.

To Reproduce Add Property: @property({ type: String, attribute: true, reflect: true }) public testString: string = 'Test'; Try to render Property:

render(){
    return html`${this.testString}`;
}

Screenshots

Desktop (please complete the following information):

• OS: Windows
• WebWriter Version 0.9.0

Additional context Only happens in Editor not in exported File. Attributes are correct in the firstUpdated but are lost in the render Function