AutoComplete requires inputValue control

[nitaking]

Describe the bug
AutoComplete is will leave values as input values even after values are cleared.

Please see my codesandbox: https://codesandbox.io/s/mui-rff-autocomplete-default-value-forked-7xzbg

Two AutoComplete in the codesandbox, and the only difference is inputValue.

	<Autocomplete
		...
		defaultValue={defaultValue}
		inputValue={defaultValue|| ""}
		...
	/>

My opinion, the input value should be cleared in conjunction with the values.

It was quite painstaking for the implementers to set this up with consideration. 😇

I wanna be happy to fix the internal implementation, maintain the doc, or do something else. If I can find the problem area, I’ll help.

To Reproduce
Steps to reproduce the behavior:

1. Create AutoComplete
2. Set that props.
3. Try values clear action.
4. Happen: don't clear input value.

Expected behavior
clear input value.

Screenshots

Desktop (please complete the following information):

• OS: macOS
• Browser chrome
• Version 92.0.4515.159

Additional context
I have not been able to isolate the problem, whether it is a problem with mui-rff, material-ui, or the way it is implemented. I would really appreciate it if you could help me.