Han only affect time limited buffs, as in ones that last X rounds.
Self stacking buffs and things like healing tips have no round limit, and are not affected by han.
The team requires han or masked man to be effective, as buff removal on the opposing team is necessary to stop your roshi from getting sniped before you can even heal.
Actually, the stacking buffs reset before starting up again. I asked a couple of people in game and that is what they noticed.
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