Vee Validate with Vuedraggable - vue.js

I tried using Vee-Validate (FieldArray) with vuedraggable but it fails saying Set operation on key failed: target is readonly.
Reproduction Link:
https://codesandbox.io/s/vee-validate-array-fields-forked-18l85h?file=/src/App.vue
Anyone who implemented it successfully, please give me suggestions!
TIA

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