I did actually.
It seems the issue comes with Supression talent, which is reducing resistances in pvp acting not only as +hit, but also as spell penetration.
Now I have asked most locks I know, and neither of them can confirm nor deny this is how it used to work in vanilla. I haven’t been able to find a source on vanilla warlock pvp that would confirm this functions correctly, or is working as intended. Seemed a little strong.
It may not be a bug at all.
Anyways for the testing, I found 2 warlocks willing to help. Testing again with 149 shadow resistance
a) The first warlock had 2/5 in Supression talents. Some of the spells are being fully resisted or partially resisted, not all of them obviously:
https: //imgur. com/rCWAbNA
b) The second warlock had 5/5 in Supression, here there are almost no resists for affli spells, only one siphon life is fully resisted, but no partial resists at all:
https: //imgur. com/hhlMjXt
Again not sure if the talent is supposed to work this way, because to my understanding it was always meant as a +hit talent, although it is highly possible its also supposed to grant normal spell penetration. As I said before, I found no source on this, it seems no one knows. But I found it a little bit odd because it seemed uber strong.
PS: if u want to dismiss my argument, do so from a classic character, not from cowardly retail character.