URL - in v5 old url structure is not working

[mortal94]

Describe the bug
When using the old URL structure of storybook v4 in storybook v5 it'll select the story in the sidebar (stories tree) and also will change the url to the new structure of v5, but the story view will not show the selected story and will show an error of "No preview".

To Reproduce
Steps to reproduce the behavior:

1. Go to the link below (offical storybook site with old structured URL)
   https://storybooks-official.netlify.com/?selectedKind=addons-knobs-withknobs&selectedStory=tweaks-static-values
2. See that the story is selected and also the URL have changed to the new URL structure but the story view shows "No preview" error.
3. Refresh the page and it'll load the page with the new url (because it was replaced) and the story view will load.

Expected behavior
For now as the documentation and code reference that the old URL structure is still being supported, so the expected behavior is that the story view will also load the selected story according to the old structure URL.

Screenshots

System:

• OS: MacOS
• Device: Macbook Pro 2018
• Browser: chrome
• Framework: react - but any framework?
• Version: 5.0.x and 5.1.x

[shilman]

Sorry for the delay @mortal94 somehow this didn't show up in my notifications.

Closing as a dupe to #6075