[pickers] Reference Date does not set the right day

[3pleFly]

Steps to reproduce

Link to live example: https://stackblitz.com/edit/react-sgimxs-pcufiq?file=Demo.tsx

Steps:

1. Add a reference date, without setting a value.
2. Date picker uses the correct year and month, but the day is set to the last day of the month.

Current behavior

Date picker uses the correct year and month, but the day is set to the last day of the month.

Expected behavior

When reference date is set, then date picker opens on the exact date provided.

Context

This is required in a use case where the value of a date picker is empty (Null). And you need the date picker component to open on a specific day. Currently it prompts the correct month and year, but the day is needed too.

Your environment

npx @mui/envinfo

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

Search keywords: referenceDate

[LukasTy]

@3pleFly I can confirm the problem exists and only on the v6 release, it seems fixed in the v7 pre-release.
We'll look into fixing the behavior on v6. 😉

[3pleFly]

@3pleFly I can confirm the problem exists and only on the v6 release, it seems fixed in the v7 pre-release. We'll look into fixing the behavior on v6. 😉

yahoo! I may update to v7 in the future, for now i'll live with it.. Looking forward :)

[LukasTy]

Fixed by #12136.

[github-actions]

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