System soft keyboard and TMP_InputField issue

I have strange issue for System soft keyboard. I enabled in Rig Required System Keyboard (Virtual keyboard Support disabled). I have in canvas TMP_Input Field. When i click on it System keyboard sometimes shown and sometimes not. I debug it and i see that when i click on Select event fired and immediately fired onDeselect event. But sometimes it work properly. Do anyone see such issues? And how to fix it?