Why is editor stack when VS2019 attach to unity?,Editor is stack when VS2019 attach to unity. Why?

Hello community !!! I wrote some async\await methods for non MonoBehavior entity. When i try to debug it and attach to unity editor stack and i cant do nothing. But when i stop debuging editor become alive and program behavior very good. It heppens when i just push in VS2019 "attach to unity" - editor STACK, i just cant push "play button" in editor. It heppens when program working and i push in VS2019 "attach to unity" - editor STACK.

WTF is this?