I found a lot of confusion and partly contradicting statements about issues with sneak attacks.

Let´s do the science with some testing with screenshots of the situation of the log to draw definitive statements.

I started with the following scenarios:

1)Ranged attack out of stealth
Result: Attack roll indicates "advantage on attack". Log provides attack roll with advantage. Sneak damage is not applied. "Hidden" Condition is lost after the sneak attack event log, but before the calculation log.
Situation: https://ibb.co/R3vt8n2
Log: https://ibb.co/7jbh3bM
Damage calc: https://ibb.co/w7d2Qq1

2)Ranged attack out of invisibility
Result: Attack roll indicates "advantage on attack". Log provides attack roll with advantage. Sneak damage is not applied. "Hidden" and "Invisible" Conditions are lost after the sneak attack event log, but before the calculation log.
Situation: https://ibb.co/tCgQPb8
Log: https://ibb.co/vD6rDCw
Damage calc: https://ibb.co/jvtqgf7

3)Melee Attack against threatened, but no "backstab"
I heard people had trouble proccing sneak in that situation
Result: Target is indicated "threatened". No advantage is indicated. On hit, 2 damage values pop up over the target (8 and 6 in that case). One(1) sneak attack event is logged, but two(2) target hit events are logged. One is the calculation for the weapon damage roll, one is the calculation for the sneak attack damage roll. Both share the same attack roll value. Sneak attack is being applied.
Situation:https://ibb.co/D70rCXQ
Damage indicator (left of astarions head) and combat log: https://ibb.co/jRkfz3L
Weapon damage calculatioN. https://ibb.co/dD8P6Ws
Sneak attack damage calculation: https://ibb.co/Lgn93b3


Known Malfunctions:

- No Ranged sneak attacks after hiding or invisibility

Reports disproven:
- Melee Sneak attack works against threatened targets.


Please feel free to test other scenarios smile