Cognito Generating UUID V7 instead of UUID V4

It "appears" to be a UUID v7 however the variant section of the UUID is invalid. It should be characters 8 - a, however it seems to be random.

This causes issues with validation...

Cognito is responsible for generating an arbitrary unique string for the sub for its user pool. You can't control (or make assumptions) about the format. From https://docs.aws.amazon.com/cognito/latest/developerguide/user-pool-settings-attributes.html#cognito-user-pools-standard-attributes

sub

The sub attribute is a unique user identifier within each user pool.

See also https://repost.aws/questions/QUfWN5qGq8R5WsocQaP1A9Dg/cognito-sub-attribute-seems-to-be-no-more-a-valid-uuid