Merge field value is deleted on the Magento store, but not on Mailchimp

[agustinbv]

Preconditions

1. Magento 2.4.2 with sample data is installed in developer mode
2. Mailchimp for Magento 103.4.44 is installed

Steps to reproduce

1. Set a Customer Attribute to be sent as a Merge Field
2. Add Customer Attribute value to a customer in the Magento Store
3. Wait until it is synced with Mailchimp, check in the Mailchimp account if the corresponding contact has the correct value in the Merge Field
4. Delete the Customer Attribute value from the customer in the Magento Store
5. Wait until it syncs again and check if the value is still there on the corresponding contact.

Actual and Expected result

Expected result:
Contact's merge field value is deleted from Mailchimp once its deleted from the corresponding customer in the Magento store.
Actual result:
Contact's merge field value still appears on Mailchimp.

Additional information

When you leave two blank spaces instead of deleting the value on the Magento store, the value does disappear from the Mailchimp contact.