Macro Issue: Certain <tt> Macros Not Working Correctly

I use a set of <tt> macros to make sure that damage is focused with what other DPS are targeting. For the most part this works great except for skills that rely on a creature's health being below a certain point for use like Mercy Stroke and Misery's End.

Is this a bug? If so is this being looked at and fixed?

Below is the current macro I am using that is giving me this issue.

/macroicon "Heavy Shot"
/ac "Mercy Stroke" <tt>
/ac "Misery's End" <tt>
/ac "Bloodletter" <tt>
/ac "Heavy Shot" <tt>
/ac "Mercy Stroke" <t>
/ac "Misery's End" <t>
/ac "Bloodletter" <t>
/ac "Heavy Shot" <t>

I'd imagine it might be because the <t> and <tt> are targeting two different things, and if one is able to be hit with Mercy/Misery and the other isn't it might just interrupt the 2nd check later on in the macro or just confuse the game or something. Or maybe the HP check only deals with what you are actively targeting. It's different than the other skills which just have to check if the cooldown is ticking or not.

Have you tried using this on your macro:

/macroicon "Mercy Stroke" <tt>
/ac "Mercy Stroke" <tt>

Maybe it will work. But I think those work on target only.