It was probably because WDF ended coho management 11/30 (standard end in PS) and gave over management to WDG for steelhead. Part of the reasoning may be (at least this holds in PS) that NI fisheries net fisheries are mandated to end 11/30 unless there is an emergency. So, WDF turned a blind eye to coho taken in the steelhead fishery because the main coho catch was earlier and these were management and accounting outliers.