Meta normalizer task is not shown and can't be cancelled

I use a lot the meta normalizer for clips in the montage in order to hit my analog chain at the desired level.
But sometimes by carelessness I launch the meta normalizer when the external FX is loaded in the master chain. At that point, the meta normalizer goes through the hardware and it takes LOT of time (especially on full projects) and it can’t be cancelled. It doesn’t appear in the task list, and the only way is just to force quit wavelab with the task manager, while hoping to loose not much unsaved work.
It would be nice that all processings that can go through the master section appear in the task list and be cancelled if needed.