[Deadlyz]

Aha, it seems the story isn't over yet. Turns out this code somehow hides the default castbars of the target and focus frames

UPDT: with -- self.auraPools:ReleaseAll() commented out it seems to work.

TargetFrame:UnregisterEvent("UNIT_AURA")
FocusFrame:UnregisterEvent("UNIT_AURA")
 
local function ReleaseAllAuras(self)
    for obj in self.auraPools:EnumerateActive() do
        obj:Hide()
    end
 
   -- self.auraPools:ReleaseAll()
end
 
hooksecurefunc(TargetFrame, "UpdateAuras", ReleaseAllAuras)
hooksecurefunc(FocusFrame, "UpdateAuras", ReleaseAllAuras)