This is an emergency fix.
The issue was fixed in dev build days ago, and it was originally deemed to not be a serious regression.
However as reported by a user on Reddit, the issue was affecting more than just the logging of cosmetic filters, it was completely breaking cosmetic filtering when the two following conditions were met:
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This update has been submitted for testing by rathann.
This update's test gating status has been changed to 'waiting'.
This update's test gating status has been changed to 'ignored'.
This update has been pushed to testing.
This update can be pushed to stable now if the maintainer wishes
This update has been submitted for stable by bodhi.
This update has been pushed to stable.