Icon="icon-bars" not working in nav bar

Questions
1

There seems to be a bug when using icon=“icon-bars”

framework7-template-react
“framework7”: “^3.6.1”,
“framework7-icons”: “^2.1.1”,
“framework7-react”: “^3.6.1”,
“material-design-icons”: “^3.0.1”,

Will not show the icon

<NavRight>
  <Link icon="icon-bars" panelOpen="right"></Link>
</NavRight>

Will show the icon

<NavRight>
    <Link panelOpen="right">
        <Icon f7="bars"></Icon>
    </Link>
</NavRight>