Did a game as Merc and then Slayer as the Host and anytime I got a boon for a skill tree talent it didn’t work.
As Merc I started with Ready for Action but when I got the boon for On Yer Feet, Mates! my shout wouldn’t revive. Same for when I got Walk it Off later. No barrier buff.
As Slayer I got the boon for High Tally but my Trophy Hunter max stack was still 3. I also received Oblivious to Pain but hard to test that one on the fly.