This is well known in the community, but it is not stated or implied to be intended anywhere. So, it should be considered a bug until clarified otherwise.
Levelling up Summon Spirit Bear acts as a new summon. It dispels the bear(actually dispel isn't even the right word here), resets it cooldowns and so on. Either it should be explicitly stated that the bear is resummoned on level-up, or the interactions should be fixed. There is not reason for it to be different compared to when a hero levels up.
Ability name
Summon Spirit Bear
Description
This is well known in the community, but it is not stated or implied to be intended anywhere. So, it should be considered a bug until clarified otherwise.
Levelling up Summon Spirit Bear acts as a new summon. It dispels the bear(actually dispel isn't even the right word here), resets it cooldowns and so on. Either it should be explicitly stated that the bear is resummoned on level-up, or the interactions should be fixed. There is not reason for it to be different compared to when a hero levels up.