Android player here. There are bugs in the New Skill Tree. These are the ones I found so far.
1. Ryoko's Water Combo doesn't target enemies. It damages allies.
2. Elly's Headshot gives target enemy 100% critical hit.
3. Elly's Sober Up, Careless Barrage, Blurry Shot doesn't show in her list of skills when unlocked.
4. Tsubaki's Ice Resistance is unusable.
I will try to find more.