What could be the reason for the view/Vue.js dev tools not updating with the new data after pushing an item into a data array?

Despite pushing data into an array, the view and Vue dev tools do not update. Why is this happening?

Even after clearing the browser cache, the issue persists.

myData = [
   [
      {
         test: true
      }
   ]
]

methods: {
   addDataItem() {
     console.log(this.myData[0].length); // = 1

     this.myData[0].push({}); 

     console.log(this.myData[0].length); // = 2. The data is successfully pushed, but why isn't the view updating in Vue dev tools?
   }
}

Strangely, this method seems to work:

this.myData.push({}); 

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