Not a bug but for running or cycling trainings, for a rest period add the min duration in the description maybe in the rest lap AND in the rep lap.
Per example, today i’ve 3x6min@tempo/r3min. But i’ve forgot the rest time during the exercice.
The 6min finishs correctly (without lap button) and recovery “say recovery until lap button” ; no idea of the duration 
.I’ve done 5min, and it is too long… Just add in the description of both parts (lap/rest) the duration would be nice ;).