I am unsure if this is a bug or if I’m misunderstanding how “+1 to all minion skills” is supposed to work, and it just needs clarification in game.
After equipping the body armor Aaron’s Will all minion skills gain one level and the game indicates I have points to spend in each of them (see screenshot 1). Though after spending one point in Skeletal Mages, the other minion skills revert back to level 20 and thus the extra skill point disappears (see screenshot 2). I can’t spend points in the other skills, so it’s not purely a UI bug.
Every time I unequip and re-equip the body armor the result is the same.
Edit: I apologize. You are in fact correct and the “missing points” can be spent without logging out and back in. It just never occured to me to try seeing “0 unspent point” to try and click on a node, even after reading your response.