The title says it all:

Why does my Pydantic model contain an extra attribute when popupated from an object with extra=ignore?

from pydantic import BaseModel, ConfigDict
# pydantic 2.4.2

class Test(BaseModel):

    a: int

    model_config = ConfigDict(extra='ignore',
                              from_attributes=True)

class TestExtended(Test):

    b: float

m = TestExtended(a=2, b=2)

# Why does m_1 contain the additional field "b" even though 
# we try to instantiate Test with extra=ignore?
m_1 = Test.model_validate(m)
print(m_1)

The output shows that the model contains both attributes:

>>> a=2 b=2.0

Any ideas what the reason for this behaviour is?