DateInput errors on valid text input when formatting using AM/PM time

[ConnorGyde]

Environment

Can be replicated using the example component found at https://blueprintjs.com/docs/#datetime2/date-input3. I'm using Firefox Developer Edition.

Steps to reproduce

1. Switch date-fns format string to LLL do, yyyy 'at' K:mm a.
2. Select a date in the date picker.
3. Delete the 'A' from 'AM'.
4. Write the 'A' again.

Actual behavior

No date is highlighted in the date picker. Upon blurring the input (clicking elsewhere on the page), the textbox displays 'Invalid date'.

Expected behavior

The date should still be highlighted in the date picker, and when blurring the input, the date should not display as invalid.