Mandarin Typing with "Pinyin" in search bar is unable to choose word

Description of the issue:*
I use Mac and type in Mandarin with Pinyin. (There are several Mandarin typing methods and Pinyin is one of them.) When I am typing and trying to choose different word in the search, the arrow keys do not work properly. For example, pressing down key will lead to other previous or suggested websites instead of words panel. Normally, in other browsers like safari or chrome, pressing up key can leads to words panel instead of other websites. It is said to press down key in Brave. Even though I try to press up key, it still leads to other websites.

How can this issue be reproduced?
I recommend to show this issue with someone who is able to speak and type in Mandarin. And please try on other browsers for comparison.

Expected result:
Please fix it.

Brave Version( check About Brave):
Version 1.10.97 Chromium: 83.0.4103.116 (Official Build) (64-bit)

Additional Information:

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