The series was just the Baby Bears Imagination the whole time.
Considering the fact that this series has more fantasy elements than the previous series does, This could be just the baby bears imagination like this would never happen in the parent series.the series is just an animated cartoon/comic book series Panda made based off his childhood with his brothers
After the events of the movie Panda started making up and sharing stories based off the the adventures he and his brothers went through as cubs, he added fantastical elements to it to make it more interesting.