Inner Beast heals less when it does more damage

[cetrei]

When I crit an Inner Beast it seems to heal about less than 1/3 compared to 90%ish with a normal Inner Beast. I'm hoping this is a bug, but I wouldn't be surprised if it was intentional. Thoughts?

EDIT: Upon further testing, it seems like the lifesteal reductions are definitely a bug. I once hit an inner beast in a berserk for 6498 damage but only absorbed 371 HP. The lifesteal also seems to consistently ignore direct hits.