I'm not sure if this is a bug or I was just very unlucky, but it seemed like I managed to run out of mind flayers in the illithid area of the Underdark. As you know, in this area you need to charm illithid and have them open doors for you (unless you have someone with 25 strength), and for this reason in the original BG2 you had an infinite supply of mind flayers here. (They respawned continuously in a room at approximately x=4100 y=1700.)
It seems to me that in BG2:EE mind flayers no longer spawn infinitely in that room, causing you to be able to run out of mind flayers and get stuck. Can someone check if this is accurate, please?