It’s a part of the new_card - yes.
But I already found the problem while this post was approved.
It did indeed was something dumb.
I thought return_card_to_hand() was the signaled function - judging by the name. I mean, that is what was happening when I pressed the button.
But it turns out it was only a part of the higher branching function, that was handling several types of inputs and redistributing it down from a singleton.
I just tunnel-visioned on this one script.
And there was the problem - higher up.
(It was deleting and storing all of the ‘pressed’ connections from the buttons on the screen. I just had to move the function call 1 line down - after it was done.)
The moral of the story: “Never tunnel vision.”
…I guess.
//Now I just need to find how to close this topic…