May be unintended. We'll take a look at the see invis / see ivu / body types of NPCs in ToFS2 in the future. Thanks!
Its not just TOFS. Myself (114) and another bard (115) have noted many times where you con a mob, says it doesn't see you then it attacks with double invis on...
You sure you aren't doing something that is breaking your invs? If you have a song running and click double invs and then the song sings it breaks. There are alot of ways you can break invs by mistake. I have never con a mob and it not see me but still aggro. Mobs also sometimes do aes that can break your invs as well.
Quite sure, but I've only been playing a bard for 20 years... We had it happen in Kael last night to three different toons. It was not my double-invis, it was other people. I did not get a message their invises had dropped, they confirmed they had both invis AAs in their buffs, but they still were seen somehow. We have a theory. If someone else in the group casts a perfected invis then I cast the bard AA invis, the result creates a stacking problem of some sort. The mobs appear to con indifferent but see the toon in question.
Odd bc I was there last week, and they did not. Not complaining, just saying. The patch may have of course reset it to the intended state.