Duplicate stepper.scss lines in addons.scss when updating theme with vaadin maven plugin

[aspan]

When updating my theme with the vaadin maven plugin I get duplicate imports of the stepper.scss in the addons.scss file, one entry contains double //.

/* This file is automatically managed and will be overwritten from time to time. */
/* Do not manually edit this file. */

/* Provided by stepper-2.4.0.jar */
@import "../../..//VAADIN/addons/stepper/stepper.scss";

/* Provided by stepper-2.4.0.jar */
@import "../../../VAADIN/addons/stepper/stepper.scss";

/* Provided by vaadin-spreadsheet-2.0.1.jar */
@import "../../../VAADIN/addons/spreadsheet/spreadsheet.scss";

/* Import and include this mixin into your project theme to include the addon themes */
@mixin addons {
	@include stepper;
	@include stepper;
	@include spreadsheet;
}

The reason for this is that the stepper MANIFEST.MF contains 3 entries for the stepper.scss

Vaadin-Stylesheets: VAADIN/addons/stepper/stepper.scss,/VAADIN/addons/
 stepper/stepper.scss,/VAADIN/addons/stepper/stepper.scss

It should only contain one entry

Vaadin-Stylesheets: VAADIN/addons/stepper/stepper.scss