This is a regression introduced in 3.3.0:

Given this code:

router.beforeEach((to, from, next) => {
  if (to.path === '/') next('/foo')
  else next()
})

router.onReady(() => {
console.log('good')
}, err => {
  console.log(err)
})

The initial navigation would trigger the second callback passed to onReady instead of the first one. This is because the Redirection Error is now visible instead of undefined