The absence of reactivity is evident when working with composition-api and nuxt3

I've got a Nuxt code snippet that is functioning correctly:

<template lang="pug">
div {{ isActive }} !-- Reactivity is working fine, isActive switches from false to true --!
</template>
<script>
export default {


  data() {
    return {
      isActive: false
    }
  },

  computed: {
    availableLanguages() {
      return this.$i18n.languages.filter(l => l.code !== this.$i18n.language)
    }
  },

  methods: {
    showDropdown() {
      console.log(this.isActive);
      this.isActive = !this.isActive;
    }
  }
}

</script>

I attempted to convert it using the composition API but encountered issues: it's not working.
There are no error messages, but it seems like there is no reactivity.
Even though the console.log shows the value changing (the template doesn't reflect the change)

<template lang="pug">
div {{ isActive }} !-- Reactivity issue, isActive always stays false when clicked (console log shows value changes) --!
</template>
<script setup>
const { language, languages } = useI18n()
const switchLanguagePath = useSwitchLocalePath()

const availableLanguages = computed(() => {
  return (languages.value).filter(l => l.code !== language.value)
});

let isActive = ref(false);
const showDropdown = () => {
  console.log(isActive);
  isActive = !isActive;
}

</script>

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