There's been some recent discussion of sneak oddities along with other squiffy game mechanics over at the threads:

https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=837642
https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=838995

Sneak has been a bone of contention for a long time, and there have been various flareups about the topic on this forum, and no doubt on other platforms, but as Ignatius says we haven't seen any announcement from Larian that they're planning to overhaul the system for the full release. Still, I live in hope.

"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"