Had to figure out how to enable the taint log to figure out that Angrier World Quests has been the root cause for this funny "taint" problem...

in the taint log I see messages such as these
An action was blocked in combat because of taint from AngrierWorldQuests - CompactRaidFrame10:Hide() Interface\FrameXML\CompactUnitFrame.lua:381 CompactUnitFrame_UpdateVisible() Interface\FrameXML\CompactUnitFrame.lua:309 CompactUnitFrame_UpdateAll() Interface\FrameXML\CompacUnitFrame.lua:193

likely also important, it is being generated on number of CompactRaidFrames ... 1 thru 31

That error is not an error in the addon.
Have a look here: https://authors.curseforge.com/forums/world-of-warcraft/official-addon-threads/unit-frames/221379-an-action-was-blocked-in-combat-because-of-taint