Due to the limit that Flake Detection should not file more than 10 bugs a day, there could be a significant delay between the flakes were active and the bug is filed. For example:

between 12:00pm and 1:00pm, a test is flaky and has 10 occurrences, however, due to the limitation, a bug is not filed; An hour later, the test is fixed and the flakes are gone at around 2:00pm; 20 hours later, Flake Detection is allowed to file new bugs, so it files a bug for this test. However, it shouldn't because the test is already fixed and is not active anymore.

One simple trick we can do is that, before filing a bug, make sure that there is at least one flake within the past 2 hours. (2 hours is just an example, this time needs to be adjusted according to the delay of flake detection).