I reported this once to support and got the reply they couldn't reproduce it. Should it surprise anyone that I was easily able to reproduce it when I next had the guardian active? For the money they make, SP has certainly horrible customer support.
Sequence of events:
- Activate guardian
- Start breeding such that breeding will complete with the help of the guardian. Say guardian remaining time 5h, breeding with guardian 4h (without guardian 20h).
- Egg is done after 4 hours, but hatchery is full. So I wait.
- Once the guardian runs out, the completed egg reverts to incomplete with the time it would have needed without guardian. In the example, 15h.