[Scrubosaur]

From the research I have done it sounds like sneak/hide was a lot more complex than just invis/itu or invis to everything except X mobs. It looks like there was also a level check involved when determining which mobs could see you. This would explain why low level people sneaking through lower guk for a mask would be seen by mobs that aren't said to be able to see through hide/sneak.

As for myself, I have run into the random see through hide/sneak while in Unrest. On two different spawns a dry bones skeleton saw me while I was in sneak/hide. I checked my logs and prior to getting hit I did not see a notice that hide or sneak had dropped. I also verified that it was a successful hide and sneak. The only thing that could have happened was I did have a message "you can not loot this corpse at this time." from using mouse look to move around. There was no drop of hide/sneak message but it is possible that it triggered it to make me seen even though I was still moving slow and appeared invisible.