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[6.0.0-alpha.33-36] cannot read property 'fromId' of undefined in docs page

See original GitHub issue

Describe the bug Navigating to docs page in Storybook 6.0.0-alpha.33-36 (32 works normally) shows a screen with Cannot read property 'fromId' of undefined error. Many additional errors are show in the console.

VM106 vendors~main.5453e29e3974fa7fe208.bundle.js:58602 Uncaught TypeError: Cannot read property 'subcomponents' of undefined

VM106 vendors~main.5453e29e3974fa7fe208.bundle.js:58880 Uncaught TypeError: Cannot read property 'fromId' of undefined

VM106 vendors~main.5453e29e3974fa7fe208.bundle.js:384927 The above error occurred in the <Context.Consumer> component

Additional context Docs use MDX combined with CSF and those errors happen only in docs view (story renders normally)

To Reproduce Navigate to docs page.

Expected behavior Should show docs normally.

Screenshots Screen Shot 2020-04-16 at 19 29 03

System:

  System:
    OS: macOS 10.15.4
    CPU: (8) x64 Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz
  Binaries:
    Node: 12.16.1 - ~/.nvm/versions/node/v12.16.1/bin/node
    Yarn: 1.17.3 - /usr/local/bin/yarn
    npm: 6.13.4 - ~/.nvm/versions/node/v12.16.1/bin/npm
  Browsers:
    Chrome: 80.0.3987.163
    Firefox: 75.0
    Safari: 13.1
  npmPackages:
    @storybook/addon-actions: v6.0.0-alpha.36 => 6.0.0-alpha.36 
    @storybook/addon-docs: v6.0.0-alpha.36 => 6.0.0-alpha.36 
    @storybook/addon-info: 5.3.12 => 5.3.12 
    @storybook/addon-knobs: v6.0.0-alpha.36 => 6.0.0-alpha.36 
    @storybook/addon-links: v6.0.0-alpha.36 => 6.0.0-alpha.36 
    @storybook/addon-notes: ^5.3.12 => 5.3.18 
    @storybook/addon-storysource: v6.0.0-alpha.36 => 6.0.0-alpha.36 
    @storybook/addon-viewport: v6.0.0-alpha.36 => 6.0.0-alpha.36 
    @storybook/addons: v6.0.0-alpha.36 => 6.0.0-alpha.36 
    @storybook/react: v6.0.0-alpha.36 => 6.0.0-alpha.36 
    @storybook/source-loader: v6.0.0-alpha.36 => 6.0.0-alpha.36