Deprecated getCurrentUserId has not been removed from base_field_override.

Workaround

Just change:

default_value_callback: 'Drupal\commerce_product\Entity\ProductVariation::getCurrentUserId'

to:

default_value_callback: 'Drupal\commerce_product\Entity\ProductVariation::getDefaultEntityOwner'
In config/default/core.base_field_override.consumer.consumer.owner_id.yml

With a fresh setup, I attempted to reproduce the issue on my system but encountered an unexpected error when trying to add a new consumer with any website.

@alfattal Could you please provide more details or steps to help reproduce the issue consistently? Let me know if there are specific configurations or scenarios I might have missed.

@kushagra.goyal Your comment is confusing. You mentioned that you've attempted to reproduce the issue and got the error that I already mentioned in this ticket, but then you are asking for testing steps to reproduce which you already did!

Nevertheless, here are the steps:

On a fresh or old Drupal setup, check the default_value_callback in the config file core.base_field_override.consumer.consumer.owner_id.yml. If it has the deprecated call back that ends with getCurrentUserId, then it will throw the error.