[docs] The file tabs on the demos are not visible

[mnajdova]

Steps to reproduce

Link to live example: (required)

Steps:

1. Open the demo in https://mui.com/x/react-charts/tooltip/#composition
2. The CustomItemTooltip file is not visible

Current behavior

No response

Expected behavior

People should be able to browse other files related to the demo

Context

No response

Your environment

npx @mui/envinfo

  Don't forget to mention which browser you used.
  Output from `npx @mui/envinfo` goes here.

Search keywords: tabs, file tabs, demos

[cherniavskii]

@mnajdova Which browser are you using? Can't reproduce it in Chromium:

[mnajdova]

Using Chrome

But, it is a caching issue, works after clearing the cache. What's surprising is that this feature is not super new, I wonder if many people would hit it 🫤