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Describe the Bug:
1- Chandra, Fire of Kaladesh doesn't count combat damage as part of the 3 damage to change to Chandra, Roaring Flame.I dealt 1 damage by activated ability and 2 by combat damage but didn't get exiled & transformed.
edit I just had it work correctly the change is that combat damage was applied first and then I activated the ability to deal 1 more damage.
2- Chandra, Roaring Flame if it has only 7 counters and activate ultimate and deal 7 damage to opponent no emblem is created.
Which card did behave improperly ?
Chandra, Fire of Kaladesh // Chandra, Roaring Flame

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2015/12/25: Battle For Zendikar,duel

What exactly should be the correct behavior/interaction ?
1- Rulings
6/22/2015 Chandra, Fire of Kaladesh’s activated ability will count any damage Chandra has dealt during the turn to any permanent or player, including combat damage.
2- Even if Chandra, Roaring Flame has only 7 counters and so goes to graveyard if you activate ultimate it still creates emblem.

Are any other cards possibly affected by this bug ?
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The emblem issue is a duplicate and applies to all planewalkers.

The damage issue works correctly in a clean game and your savegame. The issue is probably that the exile and return is triggered only after it has been tapped to do damage. So for instance if you tap to deal 1 damage to opponent and then attack and do 2 damage it won't exile because that is part of the tap ability. But if you then tap it to do another damage it will exile just fine.

The second ability is separate and has not nothing to do with first apart from counting the 1 damage.The ruling I posted is quite clear as to that and doesn't leave a window.Also the 2nd ability works for damage dealt also to creatures,planeswalkers (unlike the first) so it could work without even damaging player not even once by Chandra, Fire of Kaladesh being 3/3 or more and being blocked or damaging a planeswalker.(not tested either if they work) and having vigilance so not even tapping while attacking.

I think we are talking past each other, so just to throw everything out there...

1) The creature has 2 abilities. The first is the untap (irrelevant except for timing). The second does damage and then checks if the card should be changed. The card does not check if it should be changed unless this ability is used. When it checks it includes both types of damage.
-ex. if you attack a player and cause 2 combat damage, then untap and ping a player it changes.
-ex. if you ping a player, untap, and then attack causing 2 combat damage it does not change because it doesn't check unless you are using the ping ability.

2) When checking whether to change to a planeswalker it says "If Chandra has dealt 3 or more damage this turn...". Notice it doesn't say to whom that damage was done. So combat damage to creatures and damage to planeswalkers is counted.

Ok,my bad I have overlooked this ruling:
6/22/2015 The last sentence of Chandra, Fire of Kaladesh’s activated ability isn’t a separate ability.The check happens only as that activated ability resolves. You must activate the ability in order to exile Chandra and return her to the battlefield transformed, even if Chandra has already dealt 3 or more damage during the turn.

BAgate wrote:The emblem issue is a duplicate and applies to all planewalkers.

Do you remember where the duplicate is,I searched a lot but can't find it.I remember such reports but I don't remember if they got fixed or not or where to find them.

Duplicate is here.

I haven't tested every planeswalker, but most appear to have issues putting something in play when the cost to do so sends them to the gy. Or do you think it is card specific and needs a list?

And change condition isn't uncommon. You just have to assume if it isn't separated into another paragraph that it is part of the ability.