I have had a lot of these errors myself while hooking stuff at the orderhall ui. The (basicly) same function work at the garrison ui without any error.
Going to the orderhall and typing /run OrderHallMissionFrame:MissionCompleteInitialize() will get the same taint as you posted, whilst at the agrrison
/run GarrisonMissionFrame:MissionCompleteInitialize() wont get any taint error. I also noticed that OrderHallMissionFrame.MissionPage,"EscapePressed" will easily cause taint :/
To me it almost seems like it puts the palyer in a state comparable to an incombat state and thus causing.
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