Fighting loses the 'knock-out trap' timer

I'm wondering if the timer going away on knock-out trap by fighting isn't intentional? <697/697 436m 630mv 13644tnl 2 AM full THIEF> af You are affected by: Skill: 'sneak' for 42 hours. Spell: 'detect invis' for 30 hours. Skill: 'detect traps' for 15 hours. Skill: 'knock-out trap' for 2 hours. <697/697 436m 630mv 13644tnl 2 AM full THIEF> k 2. A crimson-robed invoker yells 'Help! Someone is attacking the guild!' You trample around loudly again. Your poisonous bite DISMEMBERS a crimson-robed invoker! A crimson-robed invoker has a few scratches. <697/697 436m 630mv 13644tnl 2 AM full THIEF> fle fle A crimson-robed invoker parries your poisonous bite. Your crush maims a crimson-robed invoker! Your crush MUTILATES a crimson-robed invoker! You parry a crimson-robed invoker's crush. A crimson-robed invoker has some small but disgusting cuts. <697/697 436m 630mv 13644tnl 2 AM full THIEF> A crimson-robed invoker says 'You aren't allowed in there!' PANIC! You couldn't escape! A crimson-robed invoker has some small but disgusting cuts. <697/697 436m 630mv 13644tnl 2 AM full THIEF> A Stairway in the Tower of Tir-Talath You are standing on the central stairway in the Tower of Tir-Talath. A crimson rug winds its way up and down the stairs. To the east, south, and west archways lead into adjacent stairwells, while to the north there is a fourth archway which is currently obstructed by a magical field. Upwards the stairs wind for quite some distance, and while it is probably a magical illusion, it appears to go on as far as the eye can see. [Exits: east south west up down] You notice your knock-out trap is still set up on the down exit. You notice your knock-out trap is still set up on the down exit. You notice your knock-out trap is still set up on the down exit. You notice your knock-out trap is still set up on the down exit. You notice your knock-out trap is still set up on the down exit. You notice your knock-out trap is still set up on the down exit. You flee from combat! <697/697 436m 629mv 13644tnl 2 AM full THIEF> hid You attempt to hide. <697/697 436m 629mv 13644tnl 2 AM full THIEF> af You are affected by: Spell: 'detect invis' for 30 hours. Skill: 'detect traps' for 15 hours. <697/697 436m 629mv 13644tnl 3 AM full THIEF> trap d k spores d You deftly begin setting a trap for the next person leaving from this place downwards. As you finish the setting, you gently dangle a bladder filled with sufficating powder! Ahh, perfection... Anyone who springs the trap will inhale the powder and fall unconscious! Rinse, Repeat. Bug?