Storybook: Storybook 6 wrong style order with material ui

[NorbertBodziony]

Describe the bug
After upgrading to storybook 6 from version 5.3 material (v4.11.0) styles are overwritten by default ones. This is not consistent some components work fine. I am using create react app with typescript.

Screenshots

Code snippets
main.js

module.exports = {
  stories:['../src/**/*.stories.tsx'],
  addons: [
    '@storybook/preset-create-react-app',
    '@storybook/addon-actions/register',
    '@storybook/addon-knobs/register',
    '@storybook/addon-viewport/register',
    '@storybook/addon-storysource'
  ]
}

preview.js

import { addDecorator, addParameters } from '@storybook/react'
import { muiTheme } from 'storybook-addon-material-ui'
import { themes } from '@storybook/theming'
import { theme } from '../src/static/theme'

addDecorator(muiTheme([theme]))
addParameters({
  backgrounds: [
    { name: 'dark', value: '#202020', default: true },
    { name: 'light', value: '#FFFFFF' }
  ],
  options: { theme: themes.dark }
})

I found some issues with exact problem but fix does not work https://github.com/mui-org/material-ui/issues/14348

Edit: After change on hot reload styles works in correct order.

[NorbertBodziony]

So i fixed that by adding :

addDecorator(storyFn => (
  <StylesProvider injectFirst>
      { storyFn() }
  </StylesProvider>
))

Instead of

export const withStylesDecorator = storyFn => (
  <StylesProvider injectFirst>{storyFn()}</StylesProvider>
)

and

addDecorator(withStylesDecorator)

No idea why it works.

[stale[bot]]

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[stale[bot]]

Hey there, it's me again! I am going close this issue to help our maintainers focus on the current development roadmap instead. If the issue mentioned is still a concern, please open a new ticket and mention this old one. Cheers and thanks for using Storybook!