I have an emisar d2 and dt8 and both are ip 67 but so far any time i tried to use them in wet conditions water got into the body. The strange thing is they didnt actually break they just acted strange for a while and then after drying for a night everything seemed okay. Except my trust in emisar. They are both amazing lights but im always extremely carefull now when using them. Kinda dissapointed. Wanted to do a nld post about my dt8 but this how it ended up. Extra details: they both fogged up, the d2 didnt really turn off correctly. The dt8 worked perfectly for hours after submersion in water but when i changed the battery i noticed the head was audably and visibly bubbling water when i screwed on the cap.
I actually just discovered this as well with my KR1. I took the pocket clip off of it though, so I’m not sure if that was a factor. It still has a separate o-ring for the tail cap so I wouldn’t have thought so. It was doing a tail stand in my shower when it started acting oddly like you say. Took it apart to find the tail cap had flooded. Still love it, though will be wary from now on.