The manufacturer of the Cobra buckle used on certain OZONE harnesses has released a safety notice for this buckle. AustriAlpin states that this issue affects a fraction of a percent of buckles produced, approximately 1 buckle in 2 million. Please inspect your OZONE harness in accordance with the pdf guide here (EN) or (DE).
If you see the issue described in the pdf then do not use your harness. Please take a photo of the buckle, note your harness serial number, and contact your OZONE dealer immediately.