v2 Calendar - Could not edit end date with time picker properly

[klsl2008]

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CodeSandbox Case (Bug Reports)
There is an issue with Calendar Input for date range value when time picker is enabled.

https://codesandbox.io/s/calendar-datetime-range-s3e6nj

Current behavior
The end datetime could not be updated by time picker.

Expected behavior
Both start and end datetime should be updated by time picker.

Minimal reproduction of the problem with instructions

1. Click on the calendar input.
2. Click on any date.
3. Click on any buttons in the time picker. The start date can be updated.
4. Click on another later date.
5. Click on any buttons in the time picker. The value of time picker goes back to start date. The end date cannot be updated properly.

Please tell us about your environment:

• Vue version: 2.6.14

• PrimeVue version: 2.9.2

• Browser: [all]