All those listed bugs happen on an healthy computer and internet connexion.
I tried to avoid the gameplay fine tune bug (like melee not doing much damage) to concentrate on abnormal behaviour of the game global content. Some may not be bugs, so Id like your feedback

1/ Invulnerablizer : when you use it but a spell was launched at you (travel delay), you still die when it reaches you.
2/ Invulnerablizer : drain life curse on you will still kills you even if you use invulnerablizer
3/ Invulnerablizer : Bolobis smell jinx on a teammate or a carnivore will kills you even if invulnerablizer is set. Same for toxic cloud from yelk or sources.
Note : healing magic skill miss a counterspell or remove curse thingies.
4/ Melee aura : sometime you activate it but the mob can still hurt you with melee attack (prolly looks like a delay issue from client to server ) in a situation like a big aggro add the healer use melee aura to safely heals dead comrades but still die because the mob reaches him even through melee aura (stats from game experience : 5% chance of melee aura failure)
5/ Melee aura #2 : used but your teammate arent protected by your aura at all (behave like a personal melee aura instead of group aura)
6/ Crazy weather (forage) : just to notice that to get some excellent or supreme source who said bad weather, it will usually pops at fair time just after or before rain. So : is bad weather so accurate ? (just before storm, early fair morning , ?) or is that just some random pops delay from a fixed weather trigger ?
7/ Crazy weather #2 : the map said fair when you see rain drops (roughly there is 1 hour in-game lag before the map weather indicator is updated)
Oh btw there is two things missing to have the prettiest ever made visible weather engine : rainbows and thunderstorm distant noise after visible lightning

8/ Teleport feature of mobs : we all know the super-sprint mob feature

9/ Skymap hop : the stars and planets map dont slide smoothly but hop every second. Maybe this is to prevent rendering lag (reduced fps).. so enable or disable this feature in user config please ! Troublesome when you seek shooting star and see funky hop instead

10/ Shooters drawback (range fight) : sometime bullets are bouncing on target and hit another party close. We see tribes and bandits fighting each other because of that. Also when happens on played character : it hits for full damage (not half damage as in PvP).
11/ Mektoub mount : seems that the invisible rider issue is still here ! (look ! a mektoub mount running alone !

12/ Frozen / lag at NPC merchants : while for sale item list is loaded after starting trade with an NPC, the game is a bit frozen (twitched mouse/camera ) looks like loading items is more important than the rendering 3D engine!
13/ Double Death (or the living dead) : dying near a spawn or being double killed (hit by mob at same time hit by a spell or curse) results by a living dead character, invisible for other, with already DP but a new respawn timer. If nothing is done, hell respawns and got another death penalty. Current solution is to quit and log in so youll be a real dead on the ground that can be rezed
14/ Region Chat worldwide (unicast effect) : If you are (coordinate) close to someone, and then teleport away, youll still hear him as he spoke in the same region as you (and vice versa).
I'd like to know if you all ever got those, and feel free to add others i forgot!