When pushing an object with a nested array of objects into an array I am losing the values of the nested array

I am trying to prepare data to use with the amCharts library. The final data structure needs to be formatted like this:

data = [{
  name: "First",
  total: 190,
  children: [
    {
        name: "A1",
        value: 100
    },
    {
        name: "A2",
        value: 60
    },
    {
        name: "A3",
        value: 30
    },
  ],
  name: "Second",
  total: 150,
  children: [
    {
        name: "B1",
        value: 100
    },
    {
        name: "B2",
        value: 30
    },
    {
        name: "B3",
        value: 20
    },
  ]
}]

My prepped data looks like this:

const data = { 
  'Corporate Investors': {
  total: 7, // total number of 'Corporate Investors', not the sum total of 'stages'
  stages: {
    Seed: 7,
    'Series A': 7,
    'Series B': 7,
    'Series C': 7,
    'Series D': 7
    }
  },
  'Angel investor': {
   total: 11,
   stages: {
     Seed: 10,
     'Series A': 10,
     'Series B': 11,
     'Series C': 11,
     'Series D': 9
}...

I've made a helper function to turn this object into the type of array that amCharts needs (modifying one from one of their demos found here: https://www.amcharts.com/demos/drill-down-treemap/

function processData(data) {

  const treeData = [];
  let typeData = {};

  // loops through the outer 'Angel investor' type-keys
  for (const key of Object.keys(data)) {
    typeData = { name: key, total: data[key].total, children: [] };

    // loops over the 'stages' for each of the outer keys
    for (const stage of Object.keys(data[key].stages)) {
      typeData.children.push({ name: stage, count: data[key].stages[stage] });
    }

    console.log('typeData pre-push: ', typeData);
    console.log('treeData pre-push: ', treeData);
    treeData.push(typeData);
    console.log('treeData post-push: ', treeData);
   }
 return treeData;
 }

There are couple of nested loops and it might be hard to follow but it DOES successfully take my original object and process it into a array format that amCharts is after, except when it is PUSHED into treeData I seem to lose the CHILDREN values. Here is the output of the console.logs from VS Code:

I have confirmed this by pulling in the data into my react component and logging it there and the children array is completely empty.

What is happening to my data when I push it in that is causing it to lose all of my children values?