Passing any prop to generic component makes other props not required (defineModel)

Vue - Official extension or vue-tsc version

2.1.10

VSCode version

1.94.2

Vue version

3.5.12

TypeScript version

5.6.3

System Info

No response

package.json dependencies

No response

Steps to reproduce

The bugs are described in the comments of the code.

App.vue

<script setup lang="ts">
import { h, ref } from 'vue';
import Comp from './Comp.vue';

const foo = ref<string>('foo');

/* BUG 1 - moved to: https://github.com/vuejs/core/issues/12307 */

// val should be of type 'string', not 'unknown'
const FunctionalComponent = () => h(Comp, {
  /* unknown */ modelValue: foo.value, 
  ['onUpdate:modelValue']: (val /* unknown */) => foo.value = val,
});
</script>

<template>

  <!-- BUG 2 -->

  <Comp/> <!-- this errors as expected, cause modelValue prop is not provided -->
  <Comp :whatever="''" /> <!-- this does not error, somehow passing *any* prop makes the model value not required? -->

</template>

Comp.vue

<script setup lang="ts" generic="T">
defineModel<T>({required: true});
</script>

<template />

What is expected?

Bug 1: ~~Render functions should have proper type based on the provided value to the generic component.~~ Moved to: https://github.com/vuejs/core/issues/12307

Bug 2: Passing any/non-existing prop to a generic component should not make the component's model value "not required".

What is actually happening?

Bug 1: ~~Render functions have 'unknown' type, regardless of the provided value to the generic component.~~ Moved to: https://github.com/vuejs/core/issues/12307

Bug 2: Passing any/non-existing prop to a generic component makes the component's model value "not required".

Link to minimal reproduction

https://github.com/DrWarpMan/vue-generic-bug

vuejs / language-tools