Sorry for the delayed reply, Hokuri. I’m afraid I was wrong about it being in the core. In DeltaTOUCH, the emojis do not render, thus:
I misunderstood @Raiden to say that this was also happening in Deltachat clients, to. On rereading, this is obviously not what Raiden said, and I should report this to @lk108 in some more appropriate place.