I was just kicked from an Isle of Conquest right after breaking the gate with one of the glaives because I've received the debuff for being afk in the glaive (was actually shooting and damaging the gate, not just afking) and did not even notice until it was too late.
I must assume it is not intentional to punish people for playing the objective and it was an unusual occasion where I did 0 dmg with my actual character due to the lack of resistance on docks but it was really frustrating. Please consider vehicle/structural damage to remove the afk debuff.
Sounds wierd, I did the same as you and was alone on a glaive thrower breaking the wall all by myself, took long but never got any AFK notice or anything.
I am unsure if it was a player reporting me based on my 0 dmg 0 hk scoreboard or maybe the system for not moving just spamming button 1.
Can Warmane confirm that damage to structures does not cancel the Inactive debuff?