The test was passing until it became constantly flaky after r259634: [r259629-r259630] NOERROR r259631 UNKNOWN r259632 NOERROR r259633 UNKNOWN r259634 TEXT PASS (Expected: PASS) [r259635-r259643] UNKNOWN r259644 TEXT PASS (Expected: PASS) [r259645-r259656] UNKNOWN r259657 TEXT PASS (Expected: PASS) [r259658-r259669] UNKNOWN r259670 NOERROR [r259671-r259674] UNKNOWN r259675 TEXT PASS (Expected: PASS) [r259676-r259693] UNKNOWN r259694 TEXT PASS (Expected: PASS) Exploring within the range [r259617-r259634] the likely cause seems to be r259629 (Use GlobalFrameIdentifier in NavigationAction), but I'm not sure. I didn't manage to reproduce the error locally.
This test(s) has been consistenly passing in the last 4000 revisions. Closing bug.