So, just for nothing, the Screen Space - Camera canvas stopped working properly with EventSystem. I pointing on button GameObject, but EventSystem says that I pointing on - Text, Text, HP, Bar, and more random canvas objects.
Canvas settings are default. Graphics raycaster is on place. All of my other canvased (Pause, Death Screen) works fine, but main does not. When I am dublicating Pause (working) canvas and copying all of UI from main canvas, nothing working. And when I creating new UI object in working (pause) canvas, it does not work.