This got completely lost in the refactoring. NcButton does not work as a router-link anymore.

Originally posted by @raimund-schluessler in 2c92c40

NcButton is not wrapped in a router-link element anymore when the to prop is set. This breaks quite some places, most prominently the use in NcBreadcrumb. While the app still navigates when to is set, the element does not behave as a router-link should, as it is not an a element anymore.