Spell dmg not showing properly

Hello,
While I was playing Blood DK deck, I noticed that damage for some spells do not show improvement from spell dmg minions (or at least for Blood Mage Talnos). Heart Strike is one example. It still does the increased dmg, but doesn’t show on card.
Also, I don’t know if this is bug, or it have to work this way, but Blood Boil doesn’t increase from spell dmg at all.

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I am playing DK in Duels now and just had the same Heart Strike issue. Dealt 4 damage with Thalnos on board, but never showed the number increase or graphic indicator with the sparkles.