Normally, spatial rings weren't supposed to hold living objects such as plants and so as time is frozen in it, but the 'hatchables' were not normal living objects…
The Thunder Lion descendant was in a state of life freeze due to the race's special nature, and only a lightning source would actually resume it's normal life cycle.
On the other hand, the dragon egg wasn't a true egg to begin with, according to the Dragon Ancestor's explanation, once I did sever the corruption from the sky dragon's body, it took this chance to recover its body by separating into two personas, temporarily pausing their life cycle as well, which would only start once given the dual Lightning-Water source…
That easily made it convenient for me till this point, but that should change from this point on as they would become actual living companions, unlike the AI Long who can access the ring as if he's not alive…