Problem with stepping in PyCharm's debugger

Hi everyone :) My question is simple. I have this code

class PiggyBank:
    def __init__(self, coins):
        self.coins = coins

    def __repr__(self):
        return f'PiggyBank({self.coins})'

    def __add__(self, other):
        if isinstance(other, int):
            return PiggyBank(self.coins + other)
        elif isinstance(other, PiggyBank):
            return PiggyBank(self.coins + other.coins)
        return NotImplemented

    def __radd__(self, other):
        return self.__add__(other)

banks = [PiggyBank(10), PiggyBank(20), PiggyBank(30)]

print(sum(banks))

I put a breakpoint here banks = [PiggyBank(10), PiggyBank(20), PiggyBank(30)], then I run debugger and click on the step into button. The debugger jumps to  self.coins = coins which is correct, but when I click on the step into button again, debugger does not return to the breakpoint(banks = [PiggyBank(10), PiggyBank(20), PiggyBank(30)]. Instead it remains at the same line just showing different values and when the instances of PyggyBank class are over, then it goes to the next line of code print(sum(banks)).  On other words: I want the debug to work like this(https://youtu.be/TQfHeQYViv0) but it works like this(https://youtu.be/CulU_gzpTnU). 

I tried to:
Restore PyCharm to the default settings

Clear the cache

Reinstall PyCharm

Install other version of PyCharm

Install other version of Python

but nothing helps.

OS Info:


PyCharm Info:

 

Python Info: