Debugging problems with deepcopy of class implementing __getattr__

Question

I have a class which has an instance variable of type enum.Flag. It implements __getattr__ so that i can return the boolean state of a flag given by name.

The code works fine when running without debugging, producing the expected output.

However, when i run it using the Visual Studio Debugger (VS 2019, 16.7.4, Python 3.6, 64-bit), it always stops in the __getattr__ method and i need to continue 100 times until i can continue normally. I have no breakpoint set!

I tested the very same code in IDLE. IDLE does NOT stop in getattr during debugging!

How can i get rid of those annoying false positives disturbing my debug session?

from enum import Flag, auto
from copy import deepcopy

class MyFlags(Flag):
    FOO = auto()
    BAR = auto()
    BAZ = auto()

class Features:
    __slots__ = ('_features', )
    
    def __init__(self, bitmask):
        self._features = bitmask

    @property
    def bitmask(self):
        return self._features

    def __getattr__(self, attr):
        try:
            return bool(MyFlags[attr].value & self._features)

        except:
            raise AttributeError(attr)

f = Features(5)

print(f.bitmask)
print(f.FOO)
print(f.BAR)
print(f.BAZ)

f = Features(3)

print(f.bitmask)
print(f.FOO)
print(f.BAR)
print(f.BAZ)

g = deepcopy(f)

print(f.bitmask)
print(f.FOO)
print(f.BAR)
print(f.BAZ)