Version

3.0.2

Reproduction link

https://jsbin.com/tizawixizi/edit?html,css,js

Steps to reproduce

  let defaultData=reactive({
        name:undefined,
    })

   defaultData.subItem=reactive([]);

function addSub(item,i,root,index) { data.subItem=reactive([]); data.parent=root let arr=[...item,data] root.subItem=arr let father=root if(father.parent){ father.subItem=[...father.subItem] console.log(father) } }

What is expected?

i want addsub then in deep level can render

What is actually happening?

can render view in deep level

bug the vue3 do not support

but the vue3 do not support? I don’t understand the point from your reproduction link, but $forceUpdate is also supported in Vue3.

Please open a new issue with a boiled down reproduction using the jsfiddle link provided on the issue helper and proper reproduction steps. Remember to use the forum or the Discord chat to ask questions!