gnome-shell become silent when ibus-pinyin activated

Reproduce environment:

• Orca 42.beta in Ubuntu 22.04 daily build
• Orca 3.37.1 in Ubuntu 20.04
• ibus-pinyin, ibus-libpinyin, ibus-sunpinyin (any Chinese input source with candidate characters panel shown on screen)

Reproduce procedure:

1. Open gnome-shell with CTRL+ALT+t
2. Input some English characters. Orca can read them normally.
3. Install ibus-pinyin with sudo apt install ibus-pinyin and activated ibus-pinyin with ibus engine pinyin.
4. After activated ibus-pinyin, there will be a panel with candidate Chinese characters shown when we touch alphabet keys. After this panel shown (this is the key step), Orca will become silent in gnome-shell except reading special keys like Enter/Control.
5. If I switch input method from ibus-pinyin to English, Orca works normally again in gnome-shell.