From the statistical point of view, the proportion of data whose fetchStartDate time is later than domainLookupStartDate time is 4/100,000. The data case is as follows：
I found that fetchStartDate value is similar to requestStartDate，this is bug？
Abnormal data in fetchStartDate field in NSURLSessionTaskTransactionMetrics object
this is bug？
Yes, and I encourage you to file a bug about it. Please post your bug number, just for the record.
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"
BUG number： FB12151170