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When you use a priority of <10 for the acf/save_post action it will run before ACF has updated the values of the fields. Using get_field() will return the old value of the field instead of the new value, so you can’t use get_field() if your update depends on the new values.
Instead you need to get the values from the $_POST values. This is an array of posted values. ACF using the ‘acf’ index of this for all field values and the index for each field is the field key for the field.
// example of $_POST $_POST['acf'] = array( 'field_0123456789acb' => 'value of field here', 'field_123456789abcd' => 'value of field here', // etc. );
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