Since the Royal Guard update, there is a bug on World Challenger and it's getting so annoying that I can't stand it anymore.
The first person who deal the first damage is the owner of the boss. However, when the boss almost die, it changes the owner to someone else. Happen to me every time. I was the owner of the boss, when boss is about 5% HP or less, then bam, the owner change from me to someone else, and that person got the loot. Note that boss did not reset and boss HP did not recover to 100%. Simply the owner just change.
Before if I got to own the boss, people just leave. Now, they stay and fight, hoping they can steal the boss, and somehow, they succeed every time.
Snail need to fix this ASAP.