The issue was addressed with improved handling of service worker lifetime. This issue is fixed in Safari 13.0.1. Service workers may leak private browsing history.
[
{
"product": "Safari",
"vendor": "Apple",
"versions": [
{
"lessThan": "Safari 13.0.1",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]