Rearranging root components in paper does not change design file

[anssit]

Steps to reproduce

Drag vaadin-checkbox between vaadin-button and vaadin-combo-box on paper in the following design:

    <template>
        <vaadin-button>
            Button
        </vaadin-button>
        <vaadin-combo-box items="[[items]]"></vaadin-combo-box>
        <vaadin-checkbox>
            Checkbox
        </vaadin-checkbox>
    </template>

Actual behavior

Component is moved correctly on paper, but neither outline nor the design file gets updated.

There is no problem if the components are wrapped inside a <div>, so this only affects root level components.

Expected behavior

Outline and design file are updated.

Workaround

Use outline or source view to rearrange root components.

IDE, Designer and OS version

Any IDE, any OS, Designer 3.0.3.