Moving an item between arrays gives error about content already being a part of the tree

[Davis Gossage]

I hit an issue where moving an item to a new array is throwing an error

const item = store.arr1.splice(0, 1)[0]
store.arr2.push(item)  // throws error item is already part of tree

If we set the data and not the proxy it works, is that the expected way to set items on arrays?

const item = store.arr1.splice(0, 1)[0]
store.arr2.push(deepClone(item))  // works