Loaders not executing in Docs

[dexster]

Describe the bug
Loader functions do not run in Docs. They work fine in Canvas

To Reproduce

1. ng new sbtest
2. npx sb init in the sbtest directory

Add the loader to the Primary button story. Note the ts-ignore as loaders are not defined on the Story type

export const Primary = Template.bind({});
Primary.args = {
  primary: true,
  label: 'Button',
};
// @ts-ignore
Primary.loaders = [
  async () => ({
    todo: console.log('LOADING PRIMARY')
  })
];

Run this and the console will log for the Canvas tab but not the Docs tab.

I realise Loaders have always been flagged as experimental but is there another way to achieve this functionality if we cannot use Loaders?

System
I tested with 6.3.6 and 6.4.0-alpha.22. Both have this issue

[shilman]

closing as dupe to #12726