We've known this for a few years, but I realised we never reported it to Apple, so let's do this.
Previous reports and data:
- 2015: T116713: Investigate nonCompliant errors for Navigation Timing schema (5% is ignored)
- 2018: T190977: Investigate NavigationTiming.nonCompliant error increase
- Public data - Grafana: EventLogging-schema / NavigationTiming
- Detailed data, journalctl as per https://wikitech.wikimedia.org/wiki/Performance/Runbook/Webperf-processor_services#navtiming.