What is the effect of a "without prejudice" ruling on the admissibility of evidence at trial?

"Trial court rulings on the admissibility of evidence, whether in limine or during trial, are generally reviewed for abuse of discretion." (Pannu v. Land Rover North America, Inc. (2011) 191 Cal.App.4th 1298, 1317.) Further, when the trial court rules on a matter "without prejudice" and explains to counsel that it would reconsider the issue upon further briefing or a further showing, failure to renew the issue forfeits it on appeal. (See People v. Mills (2010) 48 Cal.4th 158, 170.)