When changing only the time of a TimePicker using the keyboard, the date also changes to today's date. Version 5.0.0-alpha

[tran-simon]

• The issue is present in the latest release.
• I have searched the issues of this repository and believe that this is not a duplicate.

Current Behavior 😯

With the TimePicker default value at "2021-06-10T12:00:00", changing the time using the keyboard to 12:30 also changes the date to today's date. Using the picker popup doesn't change the date

Expected Behavior 🤔

The behavior should be the same whether the users uses the keyboard or the popup picker

Steps to Reproduce 🕹

https://codesandbox.io/s/keyboardtimepicker-bug-material-ui-next-mbmy6

Steps:

1. Have a TimePicker with the initial date value not in today's date
2. Change the time using the keyboard
3. The date changes

Tech	Version
@material-ui/core	v5.0.0-alpha.37
@material-ui/lab	v.5.0.0-alpha.37
React	v.17.0.2

[eps1lon]

Thanks for the report.

Seems like this has been fixed in the meantime: https://codesandbox.io/s/keyboardtimepicker-bug-material-ui-next-forked-mytp9

[tran-simon]

@eps1lon It doesn't seem fixed? In your sandbox, the date at the start is 2021-06-10. Change the time to 10:00pm, and it changes the date to today's date.

It is not the same behavior when using the picker popup