From my notes:
- BUG: A property group specified for breaks also gets selected for rounds.
eg, create a group for 40 seconds or less during a break; it will always be
selected when the clock hits 40 seconds, in round or break
- turns out this has always been broken, and has to do with the way the
conditions are evaluated.
So it has been broken for a very long time, and you are officially (if my memory serves) the first person to actually run into it. This is fixed already in 2.6.