[CheckPicker] Selected values are lost when erasing the search

[asabates]

What version of rsuite are you using?

5.0.0

What version of React are you using?

16.14.0

What browser are you using?

Firefox

Describe the Bug

Once you have selected certain values on the CheckPicker, if you try to search and then press Backspace to erase what you've written, your selected items are lost.

Expected Behavior

The selected items should remain unless manually unselected or cleared.

To Reproduce

https://rsuitejs.com/components/check-picker/

In any of the examples of the CheckPicker component, you click on it to open the option selector, select some items, search for some text in the searchbox, then erase some letters using backspace.

AwesomeScreensho.mp4