I feel like with the new cries for mobs going in, ones who never were able to see invisible, now attack you while invisible. Unless this was changed, as well.

The Dark Stalker yells 'There is nowhere to run, Random CFer! Your suffering is assured!'
The Dark Stalker's bite devastates you!
The Dark Stalker's bite hits you.
The Dark Stalker is gushing blood.

<60%hp 60%m 70%mv 1626tnl {6 PM}{wilderness}{outdoor}{33}>
The Dark Stalker's bite hits you.
The Dark Stalker's bite hits you.
*****You fade into existence.
Your shocking touch wounds the Dark Stalker.
The Dark Stalker is gushing blood.

Not sure what to tell you, except Dark Stalkers can see invis just fine and that isn't a new thing.