Validation Timing for Committed Object

I have validation rules set for attributes on the entity level. As far as I’m aware of, those rules will only be triggered when an object is committed. However, I saw a situation that validation would happen on page and prevent me from entering my microflows for custom validations. Screen capture of the page “Select Address” opens a page and “Save” evokes a microflow. I’m wondering does anyone have some insights on this? 
1 answers

On the page, in the properties of these input boxes, is the Type property under the Validation heading set to ‘Required’ or ‘Custom’? Such validations are executed at the moment of pressing a button, before the action is executed.