ESC doesn't work in VIM

Environments: 
* Pop!_OS 21.10
* IBus 1.5.25
* ibus-array 0.2.2-1
* VIM 8.2

When using ibus-array in VIM in insert mode, the ESC key cannot change VIM to normal mode. It works normally using English or Chewing.

I think maybe ibus-array has another keycode of ESC? How can I get that so I can set a keymap in VIM to solve this problem. Thank you!