Django 3.2.1 KeyError in admin panel "django/db/models/fields/related_descriptors.py", line 173

Question

I have models set up like the following:

class A(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    name = models.CharField(max_length=50)

    def __str__(self):
        return self.name

class B(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    a = models.ForeignKey(A, on_delete=models.CASCADE)
 
    def __str__(self):
        return self.a.name


class C(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)

    b = models.ForeignKey(
        B, on_delete=models.CASCADE, related_name="c_name"
    )
  
    def __str__(self):
        return self.b.a.name

When I access C in the admin panel, I'm getting the following error:

KeyError: 'a'
  File "django/db/models/fields/related_descriptors.py", line 173, in __get__
    rel_obj = self.field.get_cached_value(instance)
  File "django/db/models/fields/mixins.py", line 15, in get_cached_value
    return instance._state.fields_cache[cache_name]

I can't seem to find anything that explains why this would fail. I have looked at the underlying data (via psql) and the foreign keys are pointing to the right models etc.