Reports

Your problem is that you use the so-called 'runtime declaration' for props, when you should use the 'type-based' one. Here's the article from docs regarding this matter.

https://vuejs.org/guide/typescript/composition-api.html#typing-component-props

So to fix your issue you should refactor your component to:

<script setup lang="ts" generic="T extends ChildEntryModel">
// ...imports
const props = defineProps<{
    modelValue: T[]
}>()
</script>

https://vuejs.org/api/sfc-script-setup.html#generics

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