AWS::Cognito::UserPool LambdaVersion does not get set correctly

[MyGuyCai]

I am setting the value for AWS::Cognito::UserPool LambdaConfig PreTokenGenerationConfig LambdaVersion to 'V2_0'.
I have checked the cloudformation template in the console and it is being correctly set. However, the Cognito pre token generation lambda version is set to V1, I have checked both in the console and by attempting to use the new features.
I am able to set the version to 2 in the console and it works as intended.

Additional information: Using the serverless framework to deploy, although this shouldn't matter as the value is being set correctly confirmed in the console.

[MyGuyCai]

I have just had a thought, as the pre token generation lambda was deployed initially with the key PreTokenGeneration there may be an issue with the backwards capability. I will try completely removing the pre token generation lambda from the template then re-adding it to see if that fixes the problem. If it does I will raise a ticket in Cognito support.

[MyGuyCai]

Having removed the pre token generation lambda completely deploying, then re-adding and deploying gives the same result of the pre token generation lambda being version V1_0.

[github-actions]

Due to inactivity this issue will be closed in 7 days

[ericzbeard]

Which sample template is this about?