[pickers] DateTimePicker issue on pasting date ("ghost value": looks empty when unfocused, looks filled when focused)

[morzel85]

Steps to reproduce

Link to live example: https://mui.com/x/react-date-pickers/date-time-picker/#basic-usage

Steps:

1. Pick some date/time value (e.g. 10/17/2024 12:00 AM).
2. Paste some date to the filed (e.g. 10/19/2024).
3. Leave the field.
4. Get back to the field.

Current behavior

When date is pasted it is not changing the value shown in the field, when user moves out of the field, then the field is presented as empty (shows placeholder), when focus is restored the the date/time value is shown.

Expected behavior

Ideally pasting just a date should override the date part. Definitely field should not act as if it is empty while focus is lost and then present the value when focus is restored.

Context

No response

Your environment

npx @mui/envinfo

  System:
    OS: Linux 5.15 Ubuntu 20.04.6 LTS (Focal Fossa)
  Binaries:
    Node: 20.12.2 - ~/.nvm/versions/node/v20.12.2/bin/node
    npm: 10.5.0 - ~/.nvm/versions/node/v20.12.2/bin/npm
    pnpm: 9.7.1 - ~/.local/share/pnpm/pnpm
  Browsers:
    Chrome: 130.0.6723.69
  npmPackages:
    @emotion/react: 11.13.3 => 11.13.3 
    @emotion/styled: 11.13.0 => 11.13.0 
    @mui/icons-material: 6.1.4 => 6.1.4 
    @mui/material: 6.1.4 => 6.1.4 
    @mui/x-data-grid: 7.21.0 => 7.21.0 
    @mui/x-date-pickers: 7.21.0 => 7.21.0 
    @types/react: 18.3.3 => 18.3.3 
    react: 18.3.1 => 18.3.1 
    react-dom: 18.3.1 => 18.3.1 
    typescript: 5.5.4 => 5.5.4 

Search keywords: DateTimePicker value

[michelengelen]

Thanks for opening an issue here ... we will have a look at this. 👍🏼

[LukasTy]

The pasting is buggy in the case of Date Time Picker when pasting incomplete value.
If you were to paste the full value (including time), there would be no issues.

We need to fix this in one way or another. 👍
Ideally parsing partial value and updating only it, but at the very least there should be no mentioned inconsistent value state.

[LukasTy]

We assume that the issue might be related to the strict parsing of the date.
Maybe using non-strict parsing in the case of paste would allow us to cover such use cases.