Yes, that looks to be a bug (if that's the biggest one, I'll be very happy!).
It's actually referenced indirectly here:
- Fixed a performance issue in the editor switching to/from macros with large numbers of triggers. (forum)
As part of changes to fix that a lot of internal changes to triggers were made, including breaking the Time trigger up into its components (including At Time and Periodic as well as a couple others).
Anyway, I'll get that fixed, though probably not overly quickly.