With the 6.0 and 6.01 updates I find that the Breathe app no longer keeps a daily running total of the number of repititions during a 24 hour period. After 6.0 and fiddling with the Watch App on my iPhone, it suddenly came back until I ran the upgrade to 6.01 and now it’s gone again. I speaking of the line that says “So far today.” It just says one minute after every session. I’ve tried doing a reset several times on the watch with no affect.
One more thing to try is to rest some of the options via for Breathe on the Watch application on your iPhone. Perhaps the basic settings file was corrupted and changing some of these might force a rewrite.