[fields][DateField] fails to accept '22' as day keybord input in FR locale with format Do MMM YYYY about mui-x HOT 2 OPEN

I think I got the problem.
Do is the format to display the day of the month with as 1st / 2nd etc...
So it is a section of content type digit-with-letter

The sections of content type do not have a leading zero.
BUT in the french locale, the ordinal is only added for 1 (not sure why, 2ème exists in french...)

  ordinal: (n) => {
    const o = n === 1 ? 'er' : ''
    return `${n}${o}`
  }

So we end up in a scenario where we render 2, not 02 or 2ème.
This is a classic "onChange is not fired because you press 2 while selecting 2".

The only solution I see is to add the leading zero. Not sure exactly how complex this would be, always adding a leading zero on sections with content type digit-with-letter would clearly be controversial...
If we want to only add it when there is no ordinal, then we need to stop using section.hasLeadingZerosInInput and instead check if a section should have a leading zero based on its current value.

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I can confirm that the input of 22 does not work, all others work though.
@pcourant thanks for raising this. I will add this to the board!

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