[Bug]Path of Wisdom couldn't get "No Alarm" bonus

[SWolfS]

I found this bug in both original version and remastered version.

I chose Path of Wisdom at the beginning of a level. Took down all enemies without being detected.

But after finishing the level, I couldn't get "No Alarm" bonus and found one or two enemies who had red&black exclamatory mark.

I'm pretty sure nobody glow exclamatory marks during the whole level.

What I know is that, this bug always occurred after the ninja(Path of Wisdom) sneak attack the guard while standing around THAT THING in my upload picture.

(Sorry, I don't know how to describe THAT THING in English)

And for these levels which have too many enemies, playing as Path of Wisdom always cause this bug.