[Python] validation process in django serializer

I have a question

class RegisterSerializer(ModelSerializer):
username = CharField(required=True)

class Meta:
model = User
fields = ['username', 'password', 'email']

def create(self, validated_data):
if User.objects.filter(username=validated_data['username']).exists():
raise ValidationError('ushbu username mavjud!')
if User.objects.filter(email=validated_data['email']).exists():
raise ValidationError("ushbu email mavjud!")
user = User.objects.create_user(
username=validated_data['username'],
password=validated_data['password'],
email=validated_data['email']
)
return user


this message given for the first username in this serializer:

if User.objects.filter(username=validated_data['username']).exists():
raise ValidationError('ushbu username mavjud!')


it works, but the validation message for the email does not appear:

if User.objects.filter(email=validated_data['email']).exists():
raise ValidationError("ushbu email mavjud!")


instead, drf from its default message:

"email": [
"user with this email already exists."
]


Why is it being used?

i expected validation error given inside serializer

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