Not sure if this is a bug or not, but taking pretty much any passive in my skill tree causes my Abomination to despawn, which considering it takes skill swapping and a good 20-30 seconds to summon is beyond annoying. Even taking a passive like this one
https://i.imgur.com/pYoL78Z.png
which has no affect on minions, simply giving me life and armor, causes the Abomination to despawn. If this is intended functionality, it honestly needs to be changed because having to resummon every single time I allocate a passive point is ridiculous.