Doesn't render "%" character

[beytarovski]

vue-18n: v9.0.0.-alpha.11
vue: 3.0.0-rc.5

I use dayjs and i should return my string similar to this:

messages: {
  en: {
    time: {
      future: 'in %s',
    }
  }
}

I call t() in setup() function:

import { useI18n } from 'vue-i18n'

setup () {
  const { t, locale } = useI18n()
  console.log( t('time.future') )
}

However, it returns "in s" instead of "in %s".

I am not sure if it is a bug or a feature. How can we fix this?