im having the same issue, i can fix it by adding keep alive at the root level in app.vue but cant get it working inside the exact way i want as i have to render something dynamically

<template>
  <KeepAlive>
    <Test v-if="nestedProp" />
  </KeepAlive>
  <NuxtLayout>
    <NuxtPage />
  </NuxtLayout>
</template>