Umezawa's Jitte

[FranAvalon]

Game log:

muppet ordered combat damage from Viridian Shaman(3(2)/3(2)): Goblin Piledriver2(1/2), Goblin Warchief2(2/2), Saproling14025(1/1), Saproling14026(1/1)
muppet assigned combat damage from Viridian Shaman(3(2)/3(2)): 2 damage to Goblin Piledriver2(1/2), 1 damage to Goblin Warchief2(2/2)
Computer assigned combat damage from Goblin Warchief2(2/2): 2 damage to Viridian Shaman(3(2)/3(2))
Computer assigned combat damage from Saproling14025(1/1): 1 damage to Viridian Shaman(3(2)/3(2))
Computer assigned combat damage from Saproling14026(1/1): 1 damage to Viridian Shaman(3(2)/3(2))
Computer assigned combat damage from Goblin Piledriver2(1/2): 1 damage to Viridian Shaman(3(2)/3(2))
muppet put triggered ability of Umezawa's Jitte on the stack
muppet put triggered ability of Umezawa's Jitte on the stack
muppet resolved triggered ability of Umezawa's Jitte
muppet activated Umezawa's Jitte[CC] and targeted Goblin Warchief2(2/1(2)) (gets -1/-1 until end of turn)
muppet activated Umezawa's Jitte[C] and targeted Gempalm Incinerator3(2/1) (gets -1/-1 until end of turn)
muppet resolved triggered ability of Umezawa's Jitte
muppet activated Umezawa's Jitte[CC] and targeted Saproling14025(1/1) (gets -1/-1 until end of turn)
muppet activated Umezawa's Jitte[C] and targeted Saproling14026(1/1) (gets -1/-1 until end of turn)

Both triggers went on the stack after combat damage, so the Jitte wasn't triggering again after other creatures died -- it was triggering once for each creature it dealt damage to.

The bug is that the card says "Whenever equipped creature deals combat damage," but it's implemented in BotArena as if it says "Whenever equipped creature deals combat damage to a creature," (or player, or planeswalker).

"Whenever X deals combat damage" triggers should only trigger once for a given combat damage step. It's just like the difference between "whenever X becomes blocked" and "whenever X becomes blocked by a creature."

There aren't that many cards with that trigger -- Drinker of Sorrow is the only implemented one that isn't a "you gain that much life" ability.

(EDIT:) Testing the Drinker shows that it also suffers from this bug, so it can't be used to fix the Jitte. They both need to be fixed.