That might be a limitation of what information is out there in the system. I am sure Scott will correct if I am understanding this incorrectly but the debuff duration and cooldown timers are taken from the information blizzard gives you when checking what debuffs are available on the current target. It's possible that the information is unable to get displayed against your macro as it isn't a direct spell/ability button.
However, the showtooltip option should give the impression of one and I would have thought it would react in the same way. Unless that latter part is a limitation of how nUI checks what action button to update rather than the information Blizzard gives out.
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