May someone clarify?

I do not use Tengu much as it is still week in my hangar.  But there is an event now ... to use Tengu.

I found Tengu's ability has limited effect towards AI Bots.  

1. A killhot with pulse cannon killed me while my Tengu was in the air.

2. A AI bot killed me with Long arm while I was in stealth (certainly the red was far away).

And many many cases that the stealth does not apply to AI bots. 

Or I have very bad luck???