TimePicker shows invalid on 12hour lowercase delimiter

[evwilkin]

Describe the issue. What is the expected and unexpected behavior?
When lowercase text character(s) are used as a custom delimiter without the is24Hour prop the delimiter is made uppercase and throws an invalid error once the time is interacted with.

Please provide the steps to reproduce. Feel free to link CodeSandbox or another tool.

1. Visit the Custom delimiter example, expand the code and remove the is24Hour prop.
2. Click in the time picker field, notice the available selections include the lowercase h delimiter.
3. Select a time, notice the delimiter changes to uppercase H and causes the invalid error to show.

Is this a bug or enhancement? If this issue is a bug, is this issue blocking you or is there a work-around?
Bug