Cannot edit text nodes under template in vaadin-select

[ripla]

Steps to reproduce

1. Create a design that uses <template> with <vaadin-select>:

<vaadin-select>
    <template>
        <vaadin-list-box>
            <vaadin-item>
                Text
            </vaadin-item>
            <vaadin-item>
                Text
            </vaadin-item>
            <vaadin-item>
                Text
            </vaadin-item>
        </vaadin-list-box>
    </template>
</vaadin-select>

2. Select any text node

Actual behavior

Properties panel shows one property content with the value Text.

Expected behavior

The text area editor is shown.

IDE, Designer and OS version

IntelliJ 2018.3, Designer 4.0.0, macOS