Why didn't my Galacta trigger?

So on my final turn I - activated Araña - played Galacta on left (moved to mid) - played sp//dr on right, merged with Scarlet Spider (lucky) - Activated Scarlet Spider

But as you can see, Galacta didn't buff my Sp//dr (and hence not my Scarlet Spider)

The only thing I can think of is that Galacta was played left but moved to mid. So technically when she reveals and checks for the first card played at "another location" is not sp//dr, because it's herself?

But then wouldn't she buff herself?

Anyway, this isn't a "is this a bug" post, more just letting folks know about the weird loophole that lost me this match.