[Closed] WPML 4.6.11 and ACF Pro conflict - wrong validation of ACF select fields

Background of the issue:
I am trying to resolve a conflict between WPML 4.6.11 and ACF Pro 6.3.2 and above. I have a flexible content setup with fields like Title (text field), To Do (relationship field), and Template (select field). The select fields are set to be required and allow null. I noticed validation issues on two sites and set up a debug site with only WordPress 6.5.5, ACF Pro 6.3.3, and WPML 4.6.11. Memory limits are set to 256MB. ACF Pro support suggested reaching out to WPML support for further assistance.

Symptoms:
All select fields are not validated, and text fields of ACF Pro show a weird message 'Please fill out this field' which is not from ACF Pro. When I click on Update, select fields should be validated, but they are not, and nothing gets saved.

Questions:
Why are the select fields not being validated?
What causes the 'Please fill out this field' message in text fields?
How can I resolve the conflict between WPML 4.6.11 and ACF Pro 6.3.2 and above?