When you do so, MailWizz will create a new custom field, OPENS_SCRAPE_MAILWIZZ and will store the new info there. If it does not do that, it means you're using some custom code which prevents the app from working as designed.
I tested this and here is an issue, until we will fix the issue you can change the name of that field in something else like: Opens_Scraping_Mailwizz, you need to avoid this text "E_MAIL" in name header as you have here: OPENS_SCRAPE_MAILWIZZ.