fix: use failure event instead of error

[achingbrain]

Ignore the error event as it causes raceEvent to throw. In future we should remove the error event from the queue as all we do with it is log the error, and if we want that, the failure event gives more context around the error so can make the logs more informative.

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if necessary (this includes comments as well)
• I have added tests that prove my fix is effective or that my feature works