Pinyin input method selection failure

Testing version:
Bear 2 11586 with iPadOS

What were you doing:
Having some typo and trying to select candidates of word listed in the dialog of pinyin input method

What feature did you use:
Chinese Pinyin method.

What happened:
when I connect my iPad to a physical keyboard like the Smart Keyboard Folio and use the Chinese Pinyin input method, whenever I try to select characters while typing Pinyin, pressing the left and right arrow keys on the keyboard will cause the cursor to move in the editing interface instead of allowing me to select options smoothly in the character selection field of the Pinyin input method.

What did you expect to happen:
Having selection in Pinyin method dialog, not moving cursor in editor.