Hybrid attribute and relationship error: Neither 'InstrumentedAttribute' object nor 'Comparator' object associated with ... has an attribute

Question

I've been following the Working with Relationships section of the Hybrid Attributes SQLAlchemy guide to develop the following:

from sqlalchemy import Column, Integer, select, create_engine, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.ext.hybrid import hybrid_property
from sqlalchemy.orm import sessionmaker
from sqlalchemy.orm import relationship

Base = declarative_base()


class Parent(Base):

    __tablename__ = "parent"

    id_ = Column(Integer, primary_key=True)
    example_value = Column(Integer)

    child = relationship("Child", back_populates="parent")


class Child(Base):

    __tablename__ = "child"

    id_ = Column(Integer, primary_key=True)
    parent_id = Column(Integer, ForeignKey("parent.id_"))

    parent = relationship("Parent", foreign_keys=[parent_id])

    @hybrid_property
    def example_value_check(self):
        if self.parent.example_value == 0:
            return "No"
        elif self.parent.example_value > 0:
            return "Yes"


engine = create_engine("sqlite:///:memory:")
Base.metadata.drop_all(engine)
Base.metadata.create_all(engine)

Session = sessionmaker(bind=engine)
session = Session()

session.add(Parent(id_=1, example_value=0))
session.add(Parent(id_=2, example_value=1))
session.add(Child(parent_id=1))
session.add(Child(parent_id=2))
session.commit()

example_value_checks = session.execute(select(Child.example_value_check)).scalars()
print(example_value_checks)

However, I'm getting the following error:

AttributeError: Neither 'InstrumentedAttribute' object nor 'Comparator' object associated with Child.parent has an attribute 'example_value'

From what I can see my case is slightly different because the hybrid_property is in my Child class which also has the foreign key. However, as I'd added the equivalent relationship to the Parent class with back_populates then I figured things would work - which they haven't :(

Where should I go from here?